57021930 has 48 divisors (see below), whose sum is σ = 169438464. Its totient is φ = 13033440.

The previous prime is 57021911. The next prime is 57021931. The reversal of 57021930 is 3912075.

57021930 is a `hidden beast` number, since 570 + 2 + 1 + 93 + 0 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 57021894 and 57021903.

It is not an unprimeable number, because it can be changed into a prime (57021931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44626 + ... + 45885.

It is an arithmetic number, because the mean of its divisors is an integer number (3529968).

Almost surely, 2^57021930 is an apocalyptic number.

57021930 is an abundant number, since it is smaller than the sum of its proper divisors (112416534).

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

57021930 is a wasteful number, since it uses less digits than its factorization.

57021930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90531 (or 90528 counting only the distinct ones).

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

The square root of 57021930 is about 7551.2866453340. The cubic root of 57021930 is about 384.8994621385.

It can be divided in two parts, 570 and 21930, that added together give a square (22500 = 150²).

The spelling of 57021930 in words is "fifty-seven million, twenty-one thousand, nine hundred thirty".