78658878 has 16 divisors (see below), whose sum is σ = 159310080. Its totient is φ = 25887576.

The previous prime is 78658843. The next prime is 78658889. The reversal of 78658878 is 87885687.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82500 + ... + 83447.

It is an arithmetic number, because the mean of its divisors is an integer number (9956880).

Almost surely, 2^78658878 is an apocalyptic number.

78658878 is an abundant number, since it is smaller than the sum of its proper divisors (80651202).

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

78658878 is a wasteful number, since it uses less digits than its factorization.

78658878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166031.

The product of its digits is 6021120, while the sum is 57.

The square root of 78658878 is about 8868.9840455376. The cubic root of 78658878 is about 428.4655566735.

The spelling of 78658878 in words is "seventy-eight million, six hundred fifty-eight thousand, eight hundred seventy-eight".