56615540 has 24 divisors (see below), whose sum is σ = 122993640. Its totient is φ = 21865088.

The previous prime is 56615539. The next prime is 56615543. The reversal of 56615540 is 4551665.

It can be written as a sum of positive squares in 4 ways, for example, as 14961424 + 41654116 = 3868^2 + 6454^2 .

It is a junction number, because it is equal to n+sod(n) for n = 56615497 and 56615506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56615543) 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, 48227 + ... + 49386.

It is an arithmetic number, because the mean of its divisors is an integer number (5124735).

Almost surely, 2^56615540 is an apocalyptic number.

It is an amenable number.

56615540 is an abundant number, since it is smaller than the sum of its proper divisors (66378100).

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

56615540 is a wasteful number, since it uses less digits than its factorization.

56615540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97651 (or 97649 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 56615540 is about 7524.3298704935. The cubic root of 56615540 is about 383.9829003526.

The spelling of 56615540 in words is "fifty-six million, six hundred fifteen thousand, five hundred forty".