687134799 has 32 divisors (see below), whose sum is σ = 1101004800. Its totient is φ = 421031520.

The previous prime is 687134779. The next prime is 687134803. The reversal of 687134799 is 997431786.

It is a happy number.

It is not a de Polignac number, because 687134799 - 2²⁰ = 686086223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687134759) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79794 + ... + 87984.

It is an arithmetic number, because the mean of its divisors is an integer number (34406400).

Almost surely, 2^687134799 is an apocalyptic number.

687134799 is a deficient number, since it is larger than the sum of its proper divisors (413870001).

687134799 is a wasteful number, since it uses less digits than its factorization.

687134799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8452 (or 8446 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 687134799 is about 26213.2561693507. The cubic root of 687134799 is about 882.4307789709.

The spelling of 687134799 in words is "six hundred eighty-seven million, one hundred thirty-four thousand, seven hundred ninety-nine".