231306733878 has 64 divisors (see below), whose sum is σ = 507317990400. Its totient is φ = 69725698560.

The previous prime is 231306733831. The next prime is 231306733883. The reversal of 231306733878 is 878337603132.

It is a self number, because there is not a number n which added to its sum of digits gives 231306733878.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15908700 + ... + 15923232.

It is an arithmetic number, because the mean of its divisors is an integer number (7926843600).

Almost surely, 2^231306733878 is an apocalyptic number.

231306733878 is an abundant number, since it is smaller than the sum of its proper divisors (276011256522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231306733878 is a wasteful number, since it uses less digits than its factorization.

231306733878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15797.

The product of its (nonzero) digits is 3048192, while the sum is 51.

The spelling of 231306733878 in words is "two hundred thirty-one billion, three hundred six million, seven hundred thirty-three thousand, eight hundred seventy-eight".