649728 has 80 divisors (see below), whose sum is σ = 1964160. Its totient is φ = 211968.
The previous prime is 649717. The next prime is 649739. The reversal of 649728 is 827946.
649728 is a `hidden beast` number, since 649 + 7 + 2 + 8 = 666.
It is an interprime number because it is at equal distance from previous prime (649717) and next prime (649739).
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a junction number, because it is equal to n+sod(n) for n = 649692 and 649701.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649728.
It is an unprimeable number.
649728 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13801 + ... + 13847.
It is an arithmetic number, because the mean of its divisors is an integer number (24552).
649728 is a Friedman number, since it can be written as 47*9*6*2^8, using all its digits and the basic arithmetic operations.
2649728 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 649728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (982080).
649728 is an abundant number, since it is smaller than the sum of its proper divisors (1314432).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
649728 is an equidigital number, since it uses as much as digits as its factorization.
649728 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 74 (or 52 counting only the distinct ones).
The product of its digits is 24192, while the sum is 36.
The square root of 649728 is about 806.0570699398. The cubic root of 649728 is about 86.6118259233.
It can be divided in two parts, 64972 and 8, that added together give a triangular number (64980 = T360).
The spelling of 649728 in words is "six hundred forty-nine thousand, seven hundred twenty-eight".
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