686879028 has 120 divisors (see below), whose sum is σ = 2022392064. Its totient is φ = 201398400.

The previous prime is 686878991. The next prime is 686879041. The reversal of 686879028 is 820978686.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 107376 + ... + 113592.

Almost surely, 2^686879028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686879028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1011196032).

686879028 is an abundant number, since it is smaller than the sum of its proper divisors (1335513036).

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

686879028 is a wasteful number, since it uses less digits than its factorization.

686879028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6275 (or 6264 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The square root of 686879028 is about 26208.3770577272. The cubic root of 686879028 is about 882.3212768213.

The spelling of 686879028 in words is "six hundred eighty-six million, eight hundred seventy-nine thousand, twenty-eight".