78442188 has 48 divisors (see below), whose sum is σ = 200194176. Its totient is φ = 23708160.

The previous prime is 78442171. The next prime is 78442207. The reversal of 78442188 is 88124487.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88395 + ... + 89277.

It is an arithmetic number, because the mean of its divisors is an integer number (4170712).

Almost surely, 2^78442188 is an apocalyptic number.

It is an amenable number.

78442188 is an abundant number, since it is smaller than the sum of its proper divisors (121751988).

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

78442188 is a wasteful number, since it uses less digits than its factorization.

78442188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574 (or 1572 counting only the distinct ones).

The product of its digits is 114688, while the sum is 42.

The square root of 78442188 is about 8856.7594525312. The cubic root of 78442188 is about 428.0717482419.

The spelling of 78442188 in words is "seventy-eight million, four hundred forty-two thousand, one hundred eighty-eight".