56878621 has 2 divisors, whose sum is σ = 56878622. Its totient is φ = 56878620.

The previous prime is 56878589. The next prime is 56878631. The reversal of 56878621 is 12687865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54552996 + 2325625 = 7386^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 56878621 - 2⁵ = 56878589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56878631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28439310 + 28439311.

It is an arithmetic number, because the mean of its divisors is an integer number (28439311).

Almost surely, 2^56878621 is an apocalyptic number.

It is an amenable number.

56878621 is a deficient number, since it is larger than the sum of its proper divisors (1).

56878621 is an equidigital number, since it uses as much as digits as its factorization.

56878621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 43.

The square root of 56878621 is about 7541.7916306406. The cubic root of 56878621 is about 384.5767451819.

The spelling of 56878621 in words is "fifty-six million, eight hundred seventy-eight thousand, six hundred twenty-one".