687112424 has 16 divisors (see below), whose sum is σ = 1295014020. Its totient is φ = 341775360.

The previous prime is 687112379. The next prime is 687112441. The reversal of 687112424 is 424211786.

It can be written as a sum of positive squares in 2 ways, for example, as 676936324 + 10176100 = 26018^2 + 3190^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220967 + ... + 224054.

Almost surely, 2^687112424 is an apocalyptic number.

It is an amenable number.

687112424 is a deficient number, since it is larger than the sum of its proper divisors (607901596).

687112424 is a wasteful number, since it uses less digits than its factorization.

687112424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445220 (or 445216 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 687112424 is about 26212.8293779973. The cubic root of 687112424 is about 882.4212007421.

The spelling of 687112424 in words is "six hundred eighty-seven million, one hundred twelve thousand, four hundred twenty-four".