78456858 has 16 divisors (see below), whose sum is σ = 159486816. Its totient is φ = 25723440.

The previous prime is 78456857. The next prime is 78456863. The reversal of 78456858 is 85865487.

It is a self number, because there is not a number n which added to its sum of digits gives 78456858.

It is not an unprimeable number, because it can be changed into a prime (78456857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106816 + ... + 107547.

It is an arithmetic number, because the mean of its divisors is an integer number (9967926).

Almost surely, 2^78456858 is an apocalyptic number.

78456858 is an abundant number, since it is smaller than the sum of its proper divisors (81029958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78456858 is a wasteful number, since it uses less digits than its factorization.

78456858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214429.

The product of its digits is 2150400, while the sum is 51.

The square root of 78456858 is about 8857.5875948251. The cubic root of 78456858 is about 428.0984321020.

The spelling of 78456858 in words is "seventy-eight million, four hundred fifty-six thousand, eight hundred fifty-eight".