78890188 has 24 divisors (see below), whose sum is σ = 149234400. Its totient is φ = 36274560.

The previous prime is 78890177. The next prime is 78890213. The reversal of 78890188 is 88109887.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11913 + ... + 17311.

It is an arithmetic number, because the mean of its divisors is an integer number (6218100).

Almost surely, 2^78890188 is an apocalyptic number.

It is an amenable number.

78890188 is a deficient number, since it is larger than the sum of its proper divisors (70344212).

78890188 is a wasteful number, since it uses less digits than its factorization.

78890188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5697 (or 5695 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 49.

The square root of 78890188 is about 8882.0148615052. The cubic root of 78890188 is about 428.8851379525.

The spelling of 78890188 in words is "seventy-eight million, eight hundred ninety thousand, one hundred eighty-eight".