56501220 has 96 divisors (see below), whose sum is σ = 167924736. Its totient is φ = 14169600.

The previous prime is 56501219. The next prime is 56501227. The reversal of 56501220 is 2210565.

It is a super-2 number, since 2×56501220² = 6384775722976800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56501227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68410 + ... + 69230.

It is an arithmetic number, because the mean of its divisors is an integer number (1749216).

Almost surely, 2^56501220 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 56501220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83962368).

56501220 is an abundant number, since it is smaller than the sum of its proper divisors (111423516).

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

56501220 is a wasteful number, since it uses less digits than its factorization.

56501220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901 (or 899 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 56501220 is about 7516.7293419412. The cubic root of 56501220 is about 383.7242758100.

Adding to 56501220 its reverse (2210565), we get a palindrome (58711785).

The spelling of 56501220 in words is "fifty-six million, five hundred one thousand, two hundred twenty".