1957857864 has 16 divisors (see below), whose sum is σ = 4894644720. Its totient is φ = 652619280.

The previous prime is 1957857857. The next prime is 1957857929. The reversal of 1957857864 is 4687587591.

It is a junction number, because it is equal to n+sod(n) for n = 1957857798 and 1957857807.

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 3 ways as a sum of consecutive naturals, for example, 40788682 + ... + 40788729.

It is an arithmetic number, because the mean of its divisors is an integer number (305915295).

Almost surely, 2^1957857864 is an apocalyptic number.

It is an amenable number.

1957857864 is an abundant number, since it is smaller than the sum of its proper divisors (2936786856).

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

1957857864 is a wasteful number, since it uses less digits than its factorization.

1957857864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81577420 (or 81577416 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 60.

The square root of 1957857864 is about 44247.6876683969. The cubic root of 1957857864 is about 1251.0088631903.

The spelling of 1957857864 in words is "one billion, nine hundred fifty-seven million, eight hundred fifty-seven thousand, eight hundred sixty-four".