56161540 has 24 divisors (see below), whose sum is σ = 124877592. Its totient is φ = 21143040.

The previous prime is 56161537. The next prime is 56161543. The reversal of 56161540 is 4516165.

It is an interprime number because it is at equal distance from previous prime (56161537) and next prime (56161543).

It can be written as a sum of positive squares in 4 ways, for example, as 27688644 + 28472896 = 5262^2 + 5336^2 .

It is a junction number, because it is equal to n+sod(n) for n = 56161499 and 56161508.

It is not an unprimeable number, because it can be changed into a prime (56161543) 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, 82251 + ... + 82930.

It is an arithmetic number, because the mean of its divisors is an integer number (5203233).

Almost surely, 2^56161540 is an apocalyptic number.

It is an amenable number.

56161540 is an abundant number, since it is smaller than the sum of its proper divisors (68716052).

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

56161540 is a wasteful number, since it uses less digits than its factorization.

56161540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165207 (or 165205 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 56161540 is about 7494.1003462724. The cubic root of 56161540 is about 382.9537582759.

It can be divided in two parts, 56 and 161540, that added together give a triangular number (161596 = T₅₆₈).

The spelling of 56161540 in words is "fifty-six million, one hundred sixty-one thousand, five hundred forty".