188890322978 has 32 divisors (see below), whose sum is σ = 324583054848. Its totient is φ = 80760456000.

The previous prime is 188890322911. The next prime is 188890322981. The reversal of 188890322978 is 879223098881.

It is a super-2 number, since 2×188890322978² (a number of 23 digits) contains 22 as substring.

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, 10953623 + ... + 10970853.

It is an arithmetic number, because the mean of its divisors is an integer number (10143220464).

Almost surely, 2^188890322978 is an apocalyptic number.

188890322978 is a deficient number, since it is larger than the sum of its proper divisors (135692731870).

188890322978 is a wasteful number, since it uses less digits than its factorization.

188890322978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19058.

The product of its (nonzero) digits is 27869184, while the sum is 65.

The spelling of 188890322978 in words is "one hundred eighty-eight billion, eight hundred ninety million, three hundred twenty-two thousand, nine hundred seventy-eight".