56091865 has 16 divisors (see below), whose sum is σ = 70189056. Its totient is φ = 42984000.

The previous prime is 56091863. The next prime is 56091869. The reversal of 56091865 is 56819065.

It is not a de Polignac number, because 56091865 - 2¹ = 56091863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56091863) 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, 13864 + ... + 17446.

It is an arithmetic number, because the mean of its divisors is an integer number (4386816).

Almost surely, 2^56091865 is an apocalyptic number.

It is an amenable number.

56091865 is a deficient number, since it is larger than the sum of its proper divisors (14097191).

56091865 is a wasteful number, since it uses less digits than its factorization.

56091865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 56091865 is about 7489.4502468472. The cubic root of 56091865 is about 382.7953263377.

The spelling of 56091865 in words is "fifty-six million, ninety-one thousand, eight hundred sixty-five".