78309059 has 2 divisors, whose sum is σ = 78309060. Its totient is φ = 78309058.

The previous prime is 78308999. The next prime is 78309061. The reversal of 78309059 is 95090387.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78309059 - 2¹⁶ = 78243523 is a prime.

It is a super-2 number, since 2×78309059² = 12264617442930962, which contains 22 as substring.

Together with 78309061, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78300059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39154529 + 39154530.

It is an arithmetic number, because the mean of its divisors is an integer number (39154530).

Almost surely, 2^78309059 is an apocalyptic number.

78309059 is a deficient number, since it is larger than the sum of its proper divisors (1).

78309059 is an equidigital number, since it uses as much as digits as its factorization.

78309059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 78309059 is about 8849.2405888867. The cubic root of 78309059 is about 427.8294422611.

The spelling of 78309059 in words is "seventy-eight million, three hundred nine thousand, fifty-nine".