56978393 has 4 divisors (see below), whose sum is σ = 57000720. Its totient is φ = 56956068.

The previous prime is 56978387. The next prime is 56978399. The reversal of 56978393 is 39387965.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39387965 = 5 ⋅7877593.

It is an interprime number because it is at equal distance from previous prime (56978387) and next prime (56978399).

It is a cyclic number.

It is not a de Polignac number, because 56978393 - 2⁸ = 56978137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56978399) 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, 6755 + ... + 12632.

It is an arithmetic number, because the mean of its divisors is an integer number (14250180).

Almost surely, 2^56978393 is an apocalyptic number.

It is an amenable number.

56978393 is a deficient number, since it is larger than the sum of its proper divisors (22327).

56978393 is a wasteful number, since it uses less digits than its factorization.

56978393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22326.

The product of its digits is 1224720, while the sum is 50.

The square root of 56978393 is about 7548.4033411047. The cubic root of 56978393 is about 384.8014785819.

The spelling of 56978393 in words is "fifty-six million, nine hundred seventy-eight thousand, three hundred ninety-three".