649446528 has 128 divisors (see below), whose sum is σ = 1803686400. Its totient is φ = 206807040.

The previous prime is 649446521. The next prime is 649446541. The reversal of 649446528 is 825644946.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (649446521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1059150 + ... + 1059762.

It is an arithmetic number, because the mean of its divisors is an integer number (14091300).

Almost surely, 2^649446528 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 649446528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (901843200).

649446528 is an abundant number, since it is smaller than the sum of its proper divisors (1154239872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649446528 is a wasteful number, since it uses less digits than its factorization.

649446528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 738 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 48.

The square root of 649446528 is about 25484.2407773902. The cubic root of 649446528 is about 865.9931693232.

The spelling of 649446528 in words is "six hundred forty-nine million, four hundred forty-six thousand, five hundred twenty-eight".