57978377856 has 128 divisors (see below), whose sum is σ = 195562070400. Its totient is φ = 16565243904.

The previous prime is 57978377827. The next prime is 57978377921. The reversal of 57978377856 is 65877387975.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×57978377856² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1174105 + ... + 1222488.

It is an arithmetic number, because the mean of its divisors is an integer number (1527828675).

Almost surely, 2^57978377856 is an apocalyptic number.

57978377856 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

57978377856 is an abundant number, since it is smaller than the sum of its proper divisors (137583692544).

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

57978377856 is a wasteful number, since it uses less digits than its factorization.

57978377856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396623 (or 2396605 counting only the distinct ones).

The product of its digits is 622339200, while the sum is 72.

The spelling of 57978377856 in words is "fifty-seven billion, nine hundred seventy-eight million, three hundred seventy-seven thousand, eight hundred fifty-six".