52857940644 has 36 divisors (see below), whose sum is σ = 140645399440. Its totient is φ = 16691981040.

The previous prime is 52857940643. The next prime is 52857940649. The reversal of 52857940644 is 44604975825.

52857940644 is a `hidden beast` number, since 5 + 2 + 8 + 579 + 4 + 0 + 64 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (52857940643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38638162 + ... + 38639529.

Almost surely, 2^52857940644 is an apocalyptic number.

It is an amenable number.

52857940644 is an abundant number, since it is smaller than the sum of its proper divisors (87787458796).

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

52857940644 is a wasteful number, since it uses less digits than its factorization.

52857940644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77277720 (or 77277715 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 54.

The spelling of 52857940644 in words is "fifty-two billion, eight hundred fifty-seven million, nine hundred forty thousand, six hundred forty-four".