78320959 has 2 divisors, whose sum is σ = 78320960. Its totient is φ = 78320958.

The previous prime is 78320953. The next prime is 78320981. The reversal of 78320959 is 95902387.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78320959 - 2⁵ = 78320927 is a prime.

It is a super-2 number, since 2×78320959² = 12268345237359362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78320953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39160479 + 39160480.

It is an arithmetic number, because the mean of its divisors is an integer number (39160480).

Almost surely, 2^78320959 is an apocalyptic number.

78320959 is a deficient number, since it is larger than the sum of its proper divisors (1).

78320959 is an equidigital number, since it uses as much as digits as its factorization.

78320959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 78320959 is about 8849.9129374249. The cubic root of 78320959 is about 427.8511124338.

The spelling of 78320959 in words is "seventy-eight million, three hundred twenty thousand, nine hundred fifty-nine".