640796888 has 32 divisors (see below), whose sum is σ = 1273152000. Its totient is φ = 301514400.

The previous prime is 640796857. The next prime is 640796899. The reversal of 640796888 is 888697046.

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 7 ways as a sum of consecutive naturals, for example, 8993 + ... + 36911.

It is an arithmetic number, because the mean of its divisors is an integer number (39786000).

Almost surely, 2^640796888 is an apocalyptic number.

It is an amenable number.

640796888 is a deficient number, since it is larger than the sum of its proper divisors (632355112).

640796888 is a wasteful number, since it uses less digits than its factorization.

640796888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28095 (or 28091 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 56.

The square root of 640796888 is about 25313.9662637051. The cubic root of 640796888 is about 862.1314033201.

The spelling of 640796888 in words is "six hundred forty million, seven hundred ninety-six thousand, eight hundred eighty-eight".