57091688 has 8 divisors (see below), whose sum is σ = 107046930. Its totient is φ = 28545840.

The previous prime is 57091687. The next prime is 57091709. The reversal of 57091688 is 88619075.

It is a happy number.

57091688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 54140164 + 2951524 = 7358^2 + 1718^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (57091687) 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 as a sum of consecutive naturals, namely, 3568223 + ... + 3568238.

Almost surely, 2^57091688 is an apocalyptic number.

It is an amenable number.

57091688 is a deficient number, since it is larger than the sum of its proper divisors (49955242).

57091688 is a wasteful number, since it uses less digits than its factorization.

57091688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7136467 (or 7136463 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 57091688 is about 7555.9041814994. The cubic root of 57091688 is about 385.0563542627.

The spelling of 57091688 in words is "fifty-seven million, ninety-one thousand, six hundred eighty-eight".