57139020 has 84 divisors (see below), whose sum is σ = 179951520. Its totient is φ = 15233184.

The previous prime is 57139013. The next prime is 57139031. The reversal of 57139020 is 2093175.

57139020 is a `hidden beast` number, since 571 + 3 + 90 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 12621 + ... + 16539.

It is an arithmetic number, because the mean of its divisors is an integer number (2142280).

Almost surely, 2^57139020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57139020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89975760).

57139020 is an abundant number, since it is smaller than the sum of its proper divisors (122812500).

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

57139020 is a wasteful number, since it uses less digits than its factorization.

57139020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3946 (or 3929 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 57139020 is about 7559.0356527801. The cubic root of 57139020 is about 385.1627354990.

The spelling of 57139020 in words is "fifty-seven million, one hundred thirty-nine thousand, twenty".