640927012 has 24 divisors (see below), whose sum is σ = 1235711232. Its totient is φ = 288444000.

The previous prime is 640926991. The next prime is 640927031. The reversal of 640927012 is 210729046.

It is a super-2 number, since 2×640927012² = 821574869422496288, which contains 22 as substring.

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, 67668 + ... + 76555.

It is an arithmetic number, because the mean of its divisors is an integer number (51487968).

Almost surely, 2^640927012 is an apocalyptic number.

It is an amenable number.

640927012 is a deficient number, since it is larger than the sum of its proper divisors (594784220).

640927012 is a wasteful number, since it uses less digits than its factorization.

640927012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144339 (or 144337 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 640927012 is about 25316.5363349728. The cubic root of 640927012 is about 862.1897558683.

The spelling of 640927012 in words is "six hundred forty million, nine hundred twenty-seven thousand, twelve".