56880781 has 2 divisors, whose sum is σ = 56880782. Its totient is φ = 56880780.

The previous prime is 56880773. The next prime is 56880799. The reversal of 56880781 is 18708865.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45765225 + 11115556 = 6765^2 + 3334^2 .

It is a cyclic number.

It is not a de Polignac number, because 56880781 - 2³ = 56880773 is a prime.

It is a super-2 number, since 2×56880781² = 6470846494339922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56880721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28440390 + 28440391.

It is an arithmetic number, because the mean of its divisors is an integer number (28440391).

Almost surely, 2^56880781 is an apocalyptic number.

It is an amenable number.

56880781 is a deficient number, since it is larger than the sum of its proper divisors (1).

56880781 is an equidigital number, since it uses as much as digits as its factorization.

56880781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 43.

The square root of 56880781 is about 7541.9348313281. The cubic root of 56880781 is about 384.5816132984.

The spelling of 56880781 in words is "fifty-six million, eight hundred eighty thousand, seven hundred eighty-one".