78811672188 has 24 divisors (see below), whose sum is σ = 185612539392. Its totient is φ = 26025037744.

The previous prime is 78811672139. The next prime is 78811672211. The reversal of 78811672188 is 88127611887.

It is a happy number.

It is a super-2 number, since 2×78811672188² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30688620 + ... + 30691187.

It is an arithmetic number, because the mean of its divisors is an integer number (7733855808).

Almost surely, 2^78811672188 is an apocalyptic number.

It is an amenable number.

78811672188 is an abundant number, since it is smaller than the sum of its proper divisors (106800867204).

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

78811672188 is a wasteful number, since it uses less digits than its factorization.

78811672188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61379921 (or 61379919 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 57.

The spelling of 78811672188 in words is "seventy-eight billion, eight hundred eleven million, six hundred seventy-two thousand, one hundred eighty-eight".