686986992 has 60 divisors (see below), whose sum is σ = 1974587160. Its totient is φ = 222804864.

The previous prime is 686986991. The next prime is 686987039. The reversal of 686986992 is 299689686.

686986992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×686986992² = 943902254354416128, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686986991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59142 + ... + 69797.

It is an arithmetic number, because the mean of its divisors is an integer number (32909786).

Almost surely, 2^686986992 is an apocalyptic number.

It is an amenable number.

686986992 is an abundant number, since it is smaller than the sum of its proper divisors (1287600168).

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

686986992 is a wasteful number, since it uses less digits than its factorization.

686986992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128990 (or 128981 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 63.

The square root of 686986992 is about 26210.4366999102. The cubic root of 686986992 is about 882.3675023040.

The spelling of 686986992 in words is "six hundred eighty-six million, nine hundred eighty-six thousand, nine hundred ninety-two".