56775621 has 8 divisors (see below), whose sum is σ = 86515264. Its totient is φ = 32443200.

The previous prime is 56775613. The next prime is 56775637. The reversal of 56775621 is 12657765.

56775621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 56775621 - 2³ = 56775613 is a prime.

It is a super-2 number, since 2×56775621² = 6446942279871282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56775621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56773621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1351780 + ... + 1351821.

It is an arithmetic number, because the mean of its divisors is an integer number (10814408).

Almost surely, 2^56775621 is an apocalyptic number.

It is an amenable number.

56775621 is a deficient number, since it is larger than the sum of its proper divisors (29739643).

56775621 is a wasteful number, since it uses less digits than its factorization.

56775621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703611.

The product of its digits is 88200, while the sum is 39.

The square root of 56775621 is about 7534.9599202650. The cubic root of 56775621 is about 384.3444649416.

The spelling of 56775621 in words is "fifty-six million, seven hundred seventy-five thousand, six hundred twenty-one".