78081172923 has 64 divisors (see below), whose sum is σ = 119167372800. Its totient is φ = 45079234560.

The previous prime is 78081172919. The next prime is 78081172943. The reversal of 78081172923 is 32927118087.

It is a happy number.

It is not a de Polignac number, because 78081172923 - 2² = 78081172919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78081172913) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 57369763 + ... + 57371123.

It is an arithmetic number, because the mean of its divisors is an integer number (1861990200).

Almost surely, 2^78081172923 is an apocalyptic number.

78081172923 is a deficient number, since it is larger than the sum of its proper divisors (41086199877).

78081172923 is a wasteful number, since it uses less digits than its factorization.

78081172923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092.

The product of its (nonzero) digits is 338688, while the sum is 48.

The spelling of 78081172923 in words is "seventy-eight billion, eighty-one million, one hundred seventy-two thousand, nine hundred twenty-three".