686635416 has 24 divisors (see below), whose sum is σ = 1859637780. Its totient is φ = 228878448.

The previous prime is 686635409. The next prime is 686635421. The reversal of 686635416 is 614536686.

686635416 is a `hidden beast` number, since 6 + 8 + 6 + 635 + 4 + 1 + 6 = 666.

686635416 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4768230 + ... + 4768373.

Almost surely, 2^686635416 is an apocalyptic number.

It is an amenable number.

686635416 is an abundant number, since it is smaller than the sum of its proper divisors (1173002364).

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

686635416 is a wasteful number, since it uses less digits than its factorization.

686635416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9536615 (or 9536608 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 686635416 is about 26203.7290475993. The cubic root of 686635416 is about 882.2169549742.

The spelling of 686635416 in words is "six hundred eighty-six million, six hundred thirty-five thousand, four hundred sixteen".