72579889 has 2 divisors, whose sum is σ = 72579890. Its totient is φ = 72579888.

The previous prime is 72579887. The next prime is 72579917. The reversal of 72579889 is 98897527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61074225 + 11505664 = 7815^2 + 3392^2 .

It is a cyclic number.

It is not a de Polignac number, because 72579889 - 2¹ = 72579887 is a prime.

Together with 72579887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (72579883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36289944 + 36289945.

It is an arithmetic number, because the mean of its divisors is an integer number (36289945).

Almost surely, 2^72579889 is an apocalyptic number.

It is an amenable number.

72579889 is a deficient number, since it is larger than the sum of its proper divisors (1).

72579889 is an equidigital number, since it uses as much as digits as its factorization.

72579889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 55.

The square root of 72579889 is about 8519.3831349459. The cubic root of 72579889 is about 417.1306477976.

The spelling of 72579889 in words is "seventy-two million, five hundred seventy-nine thousand, eight hundred eighty-nine".