78965879 has 2 divisors, whose sum is σ = 78965880. Its totient is φ = 78965878.

The previous prime is 78965851. The next prime is 78965891. The reversal of 78965879 is 97856987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78965879 - 2¹⁶ = 78900343 is a prime.

It is a super-2 number, since 2×78965879² = 12471220092485282, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78965179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39482939 + 39482940.

It is an arithmetic number, because the mean of its divisors is an integer number (39482940).

Almost surely, 2^78965879 is an apocalyptic number.

78965879 is a deficient number, since it is larger than the sum of its proper divisors (1).

78965879 is an equidigital number, since it uses as much as digits as its factorization.

78965879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 59.

The square root of 78965879 is about 8886.2747537987. The cubic root of 78965879 is about 429.0222583779.

The spelling of 78965879 in words is "seventy-eight million, nine hundred sixty-five thousand, eight hundred seventy-nine".