56776421 has 8 divisors (see below), whose sum is σ = 62147064. Its totient is φ = 51549120.

The previous prime is 56776417. The next prime is 56776439. The reversal of 56776421 is 12467765.

It can be written as a sum of positive squares in 4 ways, for example, as 1809025 + 54967396 = 1345^2 + 7414^2 .

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 56776421 - 2² = 56776417 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 (56776411) 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, 35006 + ... + 36591.

It is an arithmetic number, because the mean of its divisors is an integer number (7768383).

Almost surely, 2^56776421 is an apocalyptic number.

It is an amenable number.

56776421 is a deficient number, since it is larger than the sum of its proper divisors (5370643).

56776421 is a wasteful number, since it uses less digits than its factorization.

56776421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71671.

The product of its digits is 70560, while the sum is 38.

The square root of 56776421 is about 7535.0130059609. The cubic root of 56776421 is about 384.3462701421.

The spelling of 56776421 in words is "fifty-six million, seven hundred seventy-six thousand, four hundred twenty-one".