686372028 has 24 divisors (see below), whose sum is σ = 1609130880. Its totient is φ = 227705520.

The previous prime is 686372009. The next prime is 686372041. The reversal of 686372028 is 820273686.

686372028 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 2×686372028² = 942213121641665568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133008 + ... + 138071.

It is an arithmetic number, because the mean of its divisors is an integer number (67047120).

Almost surely, 2^686372028 is an apocalyptic number.

It is an amenable number.

686372028 is an abundant number, since it is smaller than the sum of its proper divisors (922758852).

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

686372028 is a wasteful number, since it uses less digits than its factorization.

686372028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271297 (or 271295 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 686372028 is about 26198.7027923140. The cubic root of 686372028 is about 882.1041366956.

The spelling of 686372028 in words is "six hundred eighty-six million, three hundred seventy-two thousand, twenty-eight".