56745515 has 4 divisors (see below), whose sum is σ = 68094624. Its totient is φ = 45396408.

The previous prime is 56745511. The next prime is 56745529. The reversal of 56745515 is 51554765.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51554765 = 5 ⋅10310953.

It is a cyclic number.

It is not a de Polignac number, because 56745515 - 2² = 56745511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56745511) 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, 5674547 + ... + 5674556.

It is an arithmetic number, because the mean of its divisors is an integer number (17023656).

Almost surely, 2^56745515 is an apocalyptic number.

56745515 is a deficient number, since it is larger than the sum of its proper divisors (11349109).

56745515 is a wasteful number, since it uses less digits than its factorization.

56745515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11349108.

The product of its digits is 105000, while the sum is 38.

The square root of 56745515 is about 7532.9619008727. The cubic root of 56745515 is about 384.2765184058.

The spelling of 56745515 in words is "fifty-six million, seven hundred forty-five thousand, five hundred fifteen".