56681387 has 12 divisors (see below), whose sum is σ = 66060720. Its totient is φ = 48491856.

The previous prime is 56681377. The next prime is 56681413. The reversal of 56681387 is 78318665.

It is not a de Polignac number, because 56681387 - 2⁴ = 56681371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56681357) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42314 + ... + 43632.

It is an arithmetic number, because the mean of its divisors is an integer number (5505060).

Almost surely, 2^56681387 is an apocalyptic number.

56681387 is a deficient number, since it is larger than the sum of its proper divisors (9379333).

56681387 is a wasteful number, since it uses less digits than its factorization.

56681387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2210 (or 2203 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 56681387 is about 7528.7042045760. The cubic root of 56681387 is about 384.1317071177.

The spelling of 56681387 in words is "fifty-six million, six hundred eighty-one thousand, three hundred eighty-seven".