56621865 has 16 divisors (see below), whose sum is σ = 90695808. Its totient is φ = 30164736.

The previous prime is 56621863. The next prime is 56621867. The reversal of 56621865 is 56812665.

It is an interprime number because it is at equal distance from previous prime (56621863) and next prime (56621867).

It is not a de Polignac number, because 56621865 - 2¹ = 56621863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56621863) 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, 18097 + ... + 20993.

It is an arithmetic number, because the mean of its divisors is an integer number (5668488).

Almost surely, 2^56621865 is an apocalyptic number.

It is an amenable number.

56621865 is a deficient number, since it is larger than the sum of its proper divisors (34073943).

56621865 is a wasteful number, since it uses less digits than its factorization.

56621865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208.

The product of its digits is 86400, while the sum is 39.

The square root of 56621865 is about 7524.7501619655. The cubic root of 56621865 is about 383.9971991441.

The spelling of 56621865 in words is "fifty-six million, six hundred twenty-one thousand, eight hundred sixty-five".