56521520 has 60 divisors (see below), whose sum is σ = 144469920. Its totient is φ = 20549760.

The previous prime is 56521501. The next prime is 56521529. The reversal of 56521520 is 2512565.

It is a super-2 number, since 2×56521520² = 6389364446220800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56521520.

It is not an unprimeable number, because it can be changed into a prime (56521529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6761 + ... + 12599.

It is an arithmetic number, because the mean of its divisors is an integer number (2407832).

Almost surely, 2^56521520 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 56521520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72234960).

56521520 is an abundant number, since it is smaller than the sum of its proper divisors (87948400).

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

56521520 is a wasteful number, since it uses less digits than its factorization.

56521520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5874 (or 5857 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 56521520 is about 7518.0795420107. The cubic root of 56521520 is about 383.7702256738.

The spelling of 56521520 in words is "fifty-six million, five hundred twenty-one thousand, five hundred twenty".