57779778 has 16 divisors (see below), whose sum is σ = 132068160. Its totient is φ = 16508496.

The previous prime is 57779773. The next prime is 57779789. The reversal of 57779778 is 87797775.

It is not an unprimeable number, because it can be changed into a prime (57779773) 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, 687813 + ... + 687896.

It is an arithmetic number, because the mean of its divisors is an integer number (8254260).

Almost surely, 2^57779778 is an apocalyptic number.

57779778 is an abundant number, since it is smaller than the sum of its proper divisors (74288382).

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

57779778 is a wasteful number, since it uses less digits than its factorization.

57779778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375721.

The product of its digits is 6050520, while the sum is 57.

The square root of 57779778 is about 7601.3010728427. The cubic root of 57779778 is about 386.5971276387.

The spelling of 57779778 in words is "fifty-seven million, seven hundred seventy-nine thousand, seven hundred seventy-eight".