78558023 has 2 divisors, whose sum is σ = 78558024. Its totient is φ = 78558022.

The previous prime is 78558017. The next prime is 78558059. The reversal of 78558023 is 32085587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78558023 - 2⁶ = 78557959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78558923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39279011 + 39279012.

It is an arithmetic number, because the mean of its divisors is an integer number (39279012).

Almost surely, 2^78558023 is an apocalyptic number.

78558023 is a deficient number, since it is larger than the sum of its proper divisors (1).

78558023 is an equidigital number, since it uses as much as digits as its factorization.

78558023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 78558023 is about 8863.2963958112. The cubic root of 78558023 is about 428.2823547392.

The spelling of 78558023 in words is "seventy-eight million, five hundred fifty-eight thousand, twenty-three".