57172878 has 40 divisors (see below), whose sum is σ = 146413872. Its totient is φ = 16334784.

The previous prime is 57172873. The next prime is 57172981. The reversal of 57172878 is 87827175.

57172878 is a `hidden beast` number, since 571 + 7 + 2 + 8 + 78 = 666.

57172878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57172873) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 24075 + ... + 26342.

Almost surely, 2^57172878 is an apocalyptic number.

57172878 is an abundant number, since it is smaller than the sum of its proper divisors (89240994).

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

57172878 is a wasteful number, since it uses less digits than its factorization.

57172878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50438 (or 50429 counting only the distinct ones).

The product of its digits is 219520, while the sum is 45.

The square root of 57172878 is about 7561.2748925032. The cubic root of 57172878 is about 385.2387971520.

The spelling of 57172878 in words is "fifty-seven million, one hundred seventy-two thousand, eight hundred seventy-eight".