686812872 has 16 divisors (see below), whose sum is σ = 1717032240. Its totient is φ = 228937616.

The previous prime is 686812871. The next prime is 686812877. The reversal of 686812872 is 278218686.

It is a super-2 number, since 2×686812872² = 943423842289776768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (686812871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14308578 + ... + 14308625.

It is an arithmetic number, because the mean of its divisors is an integer number (107314515).

Almost surely, 2^686812872 is an apocalyptic number.

It is an amenable number.

686812872 is an abundant number, since it is smaller than the sum of its proper divisors (1030219368).

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

686812872 is a wasteful number, since it uses less digits than its factorization.

686812872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28617212 (or 28617208 counting only the distinct ones).

The product of its digits is 516096, while the sum is 48.

The square root of 686812872 is about 26207.1149117945. The cubic root of 686812872 is about 882.2929493100.

The spelling of 686812872 in words is "six hundred eighty-six million, eight hundred twelve thousand, eight hundred seventy-two".