56640637 has 2 divisors, whose sum is σ = 56640638. Its totient is φ = 56640636.

The previous prime is 56640613. The next prime is 56640641. The reversal of 56640637 is 73604665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53158681 + 3481956 = 7291^2 + 1866^2 .

It is a cyclic number.

It is not a de Polignac number, because 56640637 - 2¹⁹ = 56116349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56640596 and 56640605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56640607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28320318 + 28320319.

It is an arithmetic number, because the mean of its divisors is an integer number (28320319).

Almost surely, 2^56640637 is an apocalyptic number.

It is an amenable number.

56640637 is a deficient number, since it is larger than the sum of its proper divisors (1).

56640637 is an equidigital number, since it uses as much as digits as its factorization.

56640637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 56640637 is about 7525.9974089817. The cubic root of 56640637 is about 384.0396303319.

The spelling of 56640637 in words is "fifty-six million, six hundred forty thousand, six hundred thirty-seven".