56640533 has 2 divisors, whose sum is σ = 56640534. Its totient is φ = 56640532.

The previous prime is 56640523. The next prime is 56640541. The reversal of 56640533 is 33504665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56445169 + 195364 = 7513^2 + 442^2 .

It is a cyclic number.

It is not a de Polignac number, because 56640533 - 2¹⁴ = 56624149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56640533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56640523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28320266 + 28320267.

It is an arithmetic number, because the mean of its divisors is an integer number (28320267).

Almost surely, 2^56640533 is an apocalyptic number.

It is an amenable number.

56640533 is a deficient number, since it is larger than the sum of its proper divisors (1).

56640533 is an equidigital number, since it uses as much as digits as its factorization.

56640533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 32.

The square root of 56640533 is about 7525.9904995954. The cubic root of 56640533 is about 384.0393952819.

The spelling of 56640533 in words is "fifty-six million, six hundred forty thousand, five hundred thirty-three".