78929097785 has 24 divisors (see below), whose sum is σ = 100873482840. Its totient is φ = 59275771904.

The previous prime is 78929097781. The next prime is 78929097787. The reversal of 78929097785 is 58779092987.

It can be written as a sum of positive squares in 12 ways, for example, as 1865116969 + 77063980816 = 43187^2 + 277604^2 .

It is not a de Polignac number, because 78929097785 - 2² = 78929097781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78929097781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 491897 + ... + 632313.

It is an arithmetic number, because the mean of its divisors is an integer number (4203061785).

Almost surely, 2^78929097785 is an apocalyptic number.

It is an amenable number.

78929097785 is a deficient number, since it is larger than the sum of its proper divisors (21944385055).

78929097785 is a wasteful number, since it uses less digits than its factorization.

78929097785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140845 (or 140828 counting only the distinct ones).

The product of its (nonzero) digits is 160030080, while the sum is 71.

The spelling of 78929097785 in words is "seventy-eight billion, nine hundred twenty-nine million, ninety-seven thousand, seven hundred eighty-five".