78831979353 has 40 divisors (see below), whose sum is σ = 119429541000. Its totient is φ = 51813603072.

The previous prime is 78831979339. The next prime is 78831979357. The reversal of 78831979353 is 35397913887.

It can be written as a sum of positive squares in 4 ways, for example, as 35053949529 + 43778029824 = 187227^2 + 209232^2 .

It is not a de Polignac number, because 78831979353 - 2⁵ = 78831979321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78831979357) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2500275 + ... + 2531607.

It is an arithmetic number, because the mean of its divisors is an integer number (2985738525).

Almost surely, 2^78831979353 is an apocalyptic number.

It is an amenable number.

78831979353 is a deficient number, since it is larger than the sum of its proper divisors (40597561647).

78831979353 is a wasteful number, since it uses less digits than its factorization.

78831979353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31783 (or 31774 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 63.

The spelling of 78831979353 in words is "seventy-eight billion, eight hundred thirty-one million, nine hundred seventy-nine thousand, three hundred fifty-three".