56621520 has 120 divisors (see below), whose sum is σ = 200210400. Its totient is φ = 14300928.

The previous prime is 56621491. The next prime is 56621557. The reversal of 56621520 is 2512665.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×56621520² = 6411993054220800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11611 + ... + 15749.

It is an arithmetic number, because the mean of its divisors is an integer number (1668420).

Almost surely, 2^56621520 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 56621520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100105200).

56621520 is an abundant number, since it is smaller than the sum of its proper divisors (143588880).

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

56621520 is a wasteful number, since it uses less digits than its factorization.

56621520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4177 (or 4168 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 56621520 is about 7524.7272375814. The cubic root of 56621520 is about 383.9964192374.

The spelling of 56621520 in words is "fifty-six million, six hundred twenty-one thousand, five hundred twenty".