687139812774 has 24 divisors (see below), whose sum is σ = 1488848879232. Its totient is φ = 229039534800.

The previous prime is 687139812739. The next prime is 687139812781. The reversal of 687139812774 is 477218931786.

It is a super-2 number, since 2×687139812774² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27724 + ... + 1172624.

It is an arithmetic number, because the mean of its divisors is an integer number (62035369968).

Almost surely, 2^687139812774 is an apocalyptic number.

687139812774 is an abundant number, since it is smaller than the sum of its proper divisors (801709066458).

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

687139812774 is a wasteful number, since it uses less digits than its factorization.

687139812774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178252 (or 1178249 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 63.

The spelling of 687139812774 in words is "six hundred eighty-seven billion, one hundred thirty-nine million, eight hundred twelve thousand, seven hundred seventy-four".