686419872 has 24 divisors (see below), whose sum is σ = 1801852416. Its totient is φ = 228806592.

The previous prime is 686419849. The next prime is 686419883. The reversal of 686419872 is 278914686.

It is a tau number, because it is divible by the number of its divisors (24).

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, 3575008 + ... + 3575199.

It is an arithmetic number, because the mean of its divisors is an integer number (75077184).

Almost surely, 2^686419872 is an apocalyptic number.

It is an amenable number.

686419872 is an abundant number, since it is smaller than the sum of its proper divisors (1115432544).

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

686419872 is a wasteful number, since it uses less digits than its factorization.

686419872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7150220 (or 7150212 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 51.

The square root of 686419872 is about 26199.6158750467. The cubic root of 686419872 is about 882.1246320966.

The spelling of 686419872 in words is "six hundred eighty-six million, four hundred nineteen thousand, eight hundred seventy-two".