78874589 has 2 divisors, whose sum is σ = 78874590. Its totient is φ = 78874588.

The previous prime is 78874583. The next prime is 78874591. The reversal of 78874589 is 98547887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76125625 + 2748964 = 8725^2 + 1658^2 .

It is a cyclic number.

It is not a de Polignac number, because 78874589 - 2⁴ = 78874573 is a prime.

Together with 78874591, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78874583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39437294 + 39437295.

It is an arithmetic number, because the mean of its divisors is an integer number (39437295).

Almost surely, 2^78874589 is an apocalyptic number.

It is an amenable number.

78874589 is a deficient number, since it is larger than the sum of its proper divisors (1).

78874589 is an equidigital number, since it uses as much as digits as its factorization.

78874589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4515840, while the sum is 56.

The square root of 78874589 is about 8881.1366952660. The cubic root of 78874589 is about 428.8568681916.

The spelling of 78874589 in words is "seventy-eight million, eight hundred seventy-four thousand, five hundred eighty-nine".