1231688878 has 16 divisors (see below), whose sum is σ = 2113133184. Its totient is φ = 527450040.

The previous prime is 1231688867. The next prime is 1231688911. The reversal of 1231688878 is 8788861321.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16000 + ... + 52147.

It is an arithmetic number, because the mean of its divisors is an integer number (132070824).

Almost surely, 2^1231688878 is an apocalyptic number.

1231688878 is a deficient number, since it is larger than the sum of its proper divisors (881444306).

1231688878 is a wasteful number, since it uses less digits than its factorization.

1231688878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69447.

The product of its digits is 1032192, while the sum is 52.

The square root of 1231688878 is about 35095.4253144195. The cubic root of 1231688878 is about 1071.9314339221.

The spelling of 1231688878 in words is "one billion, two hundred thirty-one million, six hundred eighty-eight thousand, eight hundred seventy-eight".