78712589 has 2 divisors, whose sum is σ = 78712590. Its totient is φ = 78712588.

The previous prime is 78712577. The next prime is 78712603. The reversal of 78712589 is 98521787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71690089 + 7022500 = 8467^2 + 2650^2 .

It is a cyclic number.

It is not a de Polignac number, because 78712589 - 2¹² = 78708493 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 (78712559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39356294 + 39356295.

It is an arithmetic number, because the mean of its divisors is an integer number (39356295).

Almost surely, 2^78712589 is an apocalyptic number.

It is an amenable number.

78712589 is a deficient number, since it is larger than the sum of its proper divisors (1).

78712589 is an equidigital number, since it uses as much as digits as its factorization.

78712589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 47.

The square root of 78712589 is about 8872.0115531936. The cubic root of 78712589 is about 428.5630581804.

The spelling of 78712589 in words is "seventy-eight million, seven hundred twelve thousand, five hundred eighty-nine".