56776809 has 8 divisors (see below), whose sum is σ = 78312960. Its totient is φ = 36545936.

The previous prime is 56776801. The next prime is 56776817. The reversal of 56776809 is 90867765.

It is an interprime number because it is at equal distance from previous prime (56776801) and next prime (56776817).

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 56776809 - 2³ = 56776801 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56776801) 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, 326217 + ... + 326390.

It is an arithmetic number, because the mean of its divisors is an integer number (9789120).

Almost surely, 2^56776809 is an apocalyptic number.

It is an amenable number.

56776809 is a deficient number, since it is larger than the sum of its proper divisors (21536151).

56776809 is a wasteful number, since it uses less digits than its factorization.

56776809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652639.

The product of its (nonzero) digits is 635040, while the sum is 48.

The square root of 56776809 is about 7535.0387523887. The cubic root of 56776809 is about 384.3471456582.

The spelling of 56776809 in words is "fifty-six million, seven hundred seventy-six thousand, eight hundred nine".