57642989 has 2 divisors, whose sum is σ = 57642990. Its totient is φ = 57642988.

The previous prime is 57642967. The next prime is 57643031. The reversal of 57642989 is 98924675.

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., 29106025 + 28536964 = 5395^2 + 5342^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57642989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57645989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28821494 + 28821495.

It is an arithmetic number, because the mean of its divisors is an integer number (28821495).

Almost surely, 2^57642989 is an apocalyptic number.

It is an amenable number.

57642989 is a deficient number, since it is larger than the sum of its proper divisors (1).

57642989 is an equidigital number, since it uses as much as digits as its factorization.

57642989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 50.

The square root of 57642989 is about 7592.2980052155. The cubic root of 57642989 is about 386.2918073185.

The spelling of 57642989 in words is "fifty-seven million, six hundred forty-two thousand, nine hundred eighty-nine".