56161620 has 48 divisors (see below), whose sum is σ = 174726720. Its totient is φ = 14976288.

The previous prime is 56161583. The next prime is 56161627. The reversal of 56161620 is 2616165.

It is a happy number.

It is a super-2 number, since 2×56161620² = 6308255122048800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56161627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51462 + ... + 52541.

It is an arithmetic number, because the mean of its divisors is an integer number (3640140).

Almost surely, 2^56161620 is an apocalyptic number.

It is an amenable number.

56161620 is an abundant number, since it is smaller than the sum of its proper divisors (118565100).

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

56161620 is a wasteful number, since it uses less digits than its factorization.

56161620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104021 (or 104013 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 56161620 is about 7494.1056838024. The cubic root of 56161620 is about 382.9539401102.

Adding to 56161620 its reverse (2616165), we get a palindrome (58777785).

The spelling of 56161620 in words is "fifty-six million, one hundred sixty-one thousand, six hundred twenty".