78917873 has 2 divisors, whose sum is σ = 78917874. Its totient is φ = 78917872.

The previous prime is 78917851. The next prime is 78917921. The reversal of 78917873 is 37871987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54878464 + 24039409 = 7408^2 + 4903^2 .

It is a cyclic number.

It is not a de Polignac number, because 78917873 - 2²⁴ = 62140657 is a prime.

It is not a weakly prime, because it can be changed into another prime (78917803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39458936 + 39458937.

It is an arithmetic number, because the mean of its divisors is an integer number (39458937).

Almost surely, 2^78917873 is an apocalyptic number.

It is an amenable number.

78917873 is a deficient number, since it is larger than the sum of its proper divisors (1).

78917873 is an equidigital number, since it uses as much as digits as its factorization.

78917873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 50.

The square root of 78917873 is about 8883.5732112703. The cubic root of 78917873 is about 428.9353017590.

The spelling of 78917873 in words is "seventy-eight million, nine hundred seventeen thousand, eight hundred seventy-three".