57123520 has 56 divisors (see below), whose sum is σ = 137123424. Its totient is φ = 22665216.

The previous prime is 57123503. The next prime is 57123529. The reversal of 57123520 is 2532175.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (57123529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43189 + ... + 44491.

Almost surely, 2^57123520 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 57123520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68561712).

57123520 is an abundant number, since it is smaller than the sum of its proper divisors (79999904).

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

57123520 is a wasteful number, since it uses less digits than its factorization.

57123520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457 (or 1447 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 57123520 is about 7558.0103201835. The cubic root of 57123520 is about 385.1279048800.

Adding to 57123520 its reverse (2532175), we get a palindrome (59655695).

The spelling of 57123520 in words is "fifty-seven million, one hundred twenty-three thousand, five hundred twenty".