640004923122 has 32 divisors (see below), whose sum is σ = 1347430502400. Its totient is φ = 202099060368.

The previous prime is 640004923121. The next prime is 640004923127. The reversal of 640004923122 is 221329400046.

It is not an unprimeable number, because it can be changed into a prime (640004923121) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3363783 + ... + 3548949.

It is an arithmetic number, because the mean of its divisors is an integer number (42107203200).

Almost surely, 2^640004923122 is an apocalyptic number.

640004923122 is an abundant number, since it is smaller than the sum of its proper divisors (707425579278).

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

640004923122 is a wasteful number, since it uses less digits than its factorization.

640004923122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215510.

The product of its (nonzero) digits is 20736, while the sum is 33.

The spelling of 640004923122 in words is "six hundred forty billion, four million, nine hundred twenty-three thousand, one hundred twenty-two".