78523530831 has 12 divisors (see below), whose sum is σ = 114524072208. Its totient is φ = 51840777024.

The previous prime is 78523530823. The next prime is 78523530851. The reversal of 78523530831 is 13803532587.

78523530831 is a `hidden beast` number, since 7 + 85 + 2 + 3 + 530 + 8 + 31 = 666.

It is not a de Polignac number, because 78523530831 - 2³ = 78523530823 is a prime.

It is a super-2 number, since 2×78523530831² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78523530851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42352650 + ... + 42354503.

It is an arithmetic number, because the mean of its divisors is an integer number (9543672684).

Almost surely, 2^78523530831 is an apocalyptic number.

78523530831 is a deficient number, since it is larger than the sum of its proper divisors (36000541377).

78523530831 is a wasteful number, since it uses less digits than its factorization.

78523530831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84707262 (or 84707259 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 78523530831 in words is "seventy-eight billion, five hundred twenty-three million, five hundred thirty thousand, eight hundred thirty-one".