640109306900 has 36 divisors (see below), whose sum is σ = 1587471082848. Its totient is φ = 219466047840.

The previous prime is 640109306891. The next prime is 640109306957. The reversal of 640109306900 is 9603901046.

It is a super-2 number, since 2×640109306900² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 457220234 + ... + 457221633.

It is an arithmetic number, because the mean of its divisors is an integer number (44096418968).

Almost surely, 2^640109306900 is an apocalyptic number.

It is an amenable number.

640109306900 is an abundant number, since it is smaller than the sum of its proper divisors (947361775948).

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

640109306900 is a wasteful number, since it uses less digits than its factorization.

640109306900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914441888 (or 914441881 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 38.

The spelling of 640109306900 in words is "six hundred forty billion, one hundred nine million, three hundred six thousand, nine hundred".