78232509631 has 8 divisors (see below), whose sum is σ = 81106172784. Its totient is φ = 75404825280.

The previous prime is 78232509629. The next prime is 78232509647. The reversal of 78232509631 is 13690523287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78232509631 - 2¹ = 78232509629 is a prime.

It is a super-2 number, since 2×78232509631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78232509931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11491236 + ... + 11498041.

It is an arithmetic number, because the mean of its divisors is an integer number (10138271598).

Almost surely, 2^78232509631 is an apocalyptic number.

78232509631 is a deficient number, since it is larger than the sum of its proper divisors (2873663153).

78232509631 is a wasteful number, since it uses less digits than its factorization.

78232509631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22989401.

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 78232509631 in words is "seventy-eight billion, two hundred thirty-two million, five hundred nine thousand, six hundred thirty-one".