649373904 has 120 divisors (see below), whose sum is σ = 1918537920. Its totient is φ = 204627456.

The previous prime is 649373899. The next prime is 649373941. The reversal of 649373904 is 409373946.

649373904 is a `hidden beast` number, since 6 + 493 + 73 + 90 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 649373904.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 293667 + ... + 295869.

It is an arithmetic number, because the mean of its divisors is an integer number (15987816).

Almost surely, 2^649373904 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 649373904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (959268960).

649373904 is an abundant number, since it is smaller than the sum of its proper divisors (1269164016).

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

649373904 is a wasteful number, since it uses less digits than its factorization.

649373904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2329 (or 2320 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The square root of 649373904 is about 25482.8158569653. The cubic root of 649373904 is about 865.9608883836.

The spelling of 649373904 in words is "six hundred forty-nine million, three hundred seventy-three thousand, nine hundred four".