56628881 has 2 divisors, whose sum is σ = 56628882. Its totient is φ = 56628880.

The previous prime is 56628841. The next prime is 56628917. The reversal of 56628881 is 18882665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52070656 + 4558225 = 7216^2 + 2135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56628881 is a prime.

It is a super-2 number, since 2×56628881² = 6413660326624322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56628841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28314440 + 28314441.

It is an arithmetic number, because the mean of its divisors is an integer number (28314441).

Almost surely, 2^56628881 is an apocalyptic number.

It is an amenable number.

56628881 is a deficient number, since it is larger than the sum of its proper divisors (1).

56628881 is an equidigital number, since it uses as much as digits as its factorization.

56628881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 184320, while the sum is 44.

The square root of 56628881 is about 7525.2163424050. The cubic root of 56628881 is about 384.0130588188.

The spelling of 56628881 in words is "fifty-six million, six hundred twenty-eight thousand, eight hundred eighty-one".