78000057 has 8 divisors (see below), whose sum is σ = 115555680. Its totient is φ = 52000020.

The previous prime is 78000049. The next prime is 78000059. The reversal of 78000057 is 75000087.

It is not a de Polignac number, because 78000057 - 2³ = 78000049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2888891 = 78000057 / (7 + 8 + 0 + 0 + 0 + 0 + 5 + 7).

It is not an unprimeable number, because it can be changed into a prime (78000059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1444419 + ... + 1444472.

It is an arithmetic number, because the mean of its divisors is an integer number (14444460).

Almost surely, 2^78000057 is an apocalyptic number.

It is an amenable number.

78000057 is a deficient number, since it is larger than the sum of its proper divisors (37555623).

78000057 is a wasteful number, since it uses less digits than its factorization.

78000057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2888900 (or 2888894 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 78000057 is about 8831.7640933168. The cubic root of 78000057 is about 427.2659722473.

The spelling of 78000057 in words is "seventy-eight million, fifty-seven", and thus it is an aban number and an uban number.