56615387 has 4 divisors (see below), whose sum is σ = 57028776. Its totient is φ = 56202000.

The previous prime is 56615371. The next prime is 56615407. The reversal of 56615387 is 78351665.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56615387 - 2⁴ = 56615371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56615327) 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, 206489 + ... + 206762.

It is an arithmetic number, because the mean of its divisors is an integer number (14257194).

Almost surely, 2^56615387 is an apocalyptic number.

56615387 is a deficient number, since it is larger than the sum of its proper divisors (413389).

56615387 is a wasteful number, since it uses less digits than its factorization.

56615387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413388.

The product of its digits is 151200, while the sum is 41.

The square root of 56615387 is about 7524.3197034682. The cubic root of 56615387 is about 383.9825544556.

The spelling of 56615387 in words is "fifty-six million, six hundred fifteen thousand, three hundred eighty-seven".