56772557 has 2 divisors, whose sum is σ = 56772558. Its totient is φ = 56772556.

The previous prime is 56772553. The next prime is 56772587. The reversal of 56772557 is 75527765.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49477156 + 7295401 = 7034^2 + 2701^2 .

It is a cyclic number.

It is not a de Polignac number, because 56772557 - 2² = 56772553 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56772553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28386278 + 28386279.

It is an arithmetic number, because the mean of its divisors is an integer number (28386279).

Almost surely, 2^56772557 is an apocalyptic number.

It is an amenable number.

56772557 is a deficient number, since it is larger than the sum of its proper divisors (1).

56772557 is an equidigital number, since it uses as much as digits as its factorization.

56772557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 514500, while the sum is 44.

The square root of 56772557 is about 7534.7565985903. The cubic root of 56772557 is about 384.3375508671.

The spelling of 56772557 in words is "fifty-six million, seven hundred seventy-two thousand, five hundred fifty-seven".