57611620 has 48 divisors (see below), whose sum is σ = 132568128. Its totient is φ = 20856960.

The previous prime is 57611611. The next prime is 57611663. The reversal of 57611620 is 2611675.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67114 + ... + 67966.

It is an arithmetic number, because the mean of its divisors is an integer number (2761836).

Almost surely, 2^57611620 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 57611620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66284064).

57611620 is an abundant number, since it is smaller than the sum of its proper divisors (74956508).

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

57611620 is a wasteful number, since it uses less digits than its factorization.

57611620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180 (or 1178 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 57611620 is about 7590.2318805159. The cubic root of 57611620 is about 386.2217219726.

Subtracting from 57611620 its reverse (2611675), we obtain a palindrome (54999945).

It can be divided in two parts, 5761 and 1620, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 57611620 in words is "fifty-seven million, six hundred eleven thousand, six hundred twenty".