56978669 has 8 divisors (see below), whose sum is σ = 62264640. Its totient is φ = 51710400.

The previous prime is 56978641. The next prime is 56978729. The reversal of 56978669 is 96687965.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56978669 - 2⁸ = 56978413 is a prime.

It is a super-2 number, since 2×56978669² = 6493137442023122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56978629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2837 + ... + 11045.

It is an arithmetic number, because the mean of its divisors is an integer number (7783080).

Almost surely, 2^56978669 is an apocalyptic number.

It is an amenable number.

56978669 is a deficient number, since it is larger than the sum of its proper divisors (5285971).

56978669 is a wasteful number, since it uses less digits than its factorization.

56978669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8851.

The product of its digits is 4898880, while the sum is 56.

The square root of 56978669 is about 7548.4216230945. The cubic root of 56978669 is about 384.8020998995.

The spelling of 56978669 in words is "fifty-six million, nine hundred seventy-eight thousand, six hundred sixty-nine".