56281665 has 32 divisors (see below), whose sum is σ = 98620416. Its totient is φ = 27181760.

The previous prime is 56281649. The next prime is 56281669. The reversal of 56281665 is 56618265.

It is not a de Polignac number, because 56281665 - 2⁴ = 56281649 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56281669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56764 + ... + 57746.

It is an arithmetic number, because the mean of its divisors is an integer number (3081888).

Almost surely, 2^56281665 is an apocalyptic number.

56281665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

56281665 is a deficient number, since it is larger than the sum of its proper divisors (42338751).

56281665 is a wasteful number, since it uses less digits than its factorization.

56281665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349.

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

The square root of 56281665 is about 7502.1107029955. The cubic root of 56281665 is about 383.2265995638.

The spelling of 56281665 in words is "fifty-six million, two hundred eighty-one thousand, six hundred sixty-five".