56781415 has 4 divisors (see below), whose sum is σ = 68137704. Its totient is φ = 45425128.

The previous prime is 56781397. The next prime is 56781419. The reversal of 56781415 is 51418765.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51418765 = 5 ⋅10283753.

It is a cyclic number.

It is not a de Polignac number, because 56781415 - 2⁵ = 56781383 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 (56781419) 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, 5678137 + ... + 5678146.

It is an arithmetic number, because the mean of its divisors is an integer number (17034426).

Almost surely, 2^56781415 is an apocalyptic number.

56781415 is a deficient number, since it is larger than the sum of its proper divisors (11356289).

56781415 is a wasteful number, since it uses less digits than its factorization.

56781415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11356288.

The product of its digits is 33600, while the sum is 37.

The square root of 56781415 is about 7535.3443849634. The cubic root of 56781415 is about 384.3575387225.

The spelling of 56781415 in words is "fifty-six million, seven hundred eighty-one thousand, four hundred fifteen".