649204140 has 96 divisors (see below), whose sum is σ = 1990920960. Its totient is φ = 157084416.

The previous prime is 649204117. The next prime is 649204169. The reversal of 649204140 is 41402946.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 649204098 and 649204107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38967 + ... + 53073.

It is an arithmetic number, because the mean of its divisors is an integer number (20738760).

Almost surely, 2^649204140 is an apocalyptic number.

649204140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649204140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (995460480).

649204140 is an abundant number, since it is smaller than the sum of its proper divisors (1341716820).

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

649204140 is a wasteful number, since it uses less digits than its factorization.

649204140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14191 (or 14189 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 649204140 is about 25479.4846886667. The cubic root of 649204140 is about 865.8854198973.

The spelling of 649204140 in words is "six hundred forty-nine million, two hundred four thousand, one hundred forty".