57866820 has 96 divisors (see below), whose sum is σ = 180956160. Its totient is φ = 13695360.

The previous prime is 57866819. The next prime is 57866843. The reversal of 57866820 is 2866875.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27361 + ... + 29399.

It is an arithmetic number, because the mean of its divisors is an integer number (1884960).

Almost surely, 2^57866820 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 57866820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90478080).

57866820 is an abundant number, since it is smaller than the sum of its proper divisors (123089340).

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

57866820 is a wasteful number, since it uses less digits than its factorization.

57866820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105 (or 2103 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 57866820 is about 7607.0243853954. The cubic root of 57866820 is about 386.7911592134.

Subtracting from 57866820 its reverse (2866875), we obtain a palindrome (54999945).

The spelling of 57866820 in words is "fifty-seven million, eight hundred sixty-six thousand, eight hundred twenty".