56720687 has 4 divisors (see below), whose sum is σ = 60057216. Its totient is φ = 53384160.

The previous prime is 56720683. The next prime is 56720701. The reversal of 56720687 is 78602765.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78602765 = 5 ⋅15720553.

It is a cyclic number.

It is not a de Polignac number, because 56720687 - 2² = 56720683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56720683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1668239 + ... + 1668272.

It is an arithmetic number, because the mean of its divisors is an integer number (15014304).

Almost surely, 2^56720687 is an apocalyptic number.

56720687 is a deficient number, since it is larger than the sum of its proper divisors (3336529).

56720687 is a wasteful number, since it uses less digits than its factorization.

56720687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3336528.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 56720687 is about 7531.3137632156. The cubic root of 56720687 is about 384.2204657574.

The spelling of 56720687 in words is "fifty-six million, seven hundred twenty thousand, six hundred eighty-seven".