686938320 has 200 divisors, whose sum is σ = 2401480224. Its totient is φ = 181986048.

The previous prime is 686938297. The next prime is 686938339. The reversal of 686938320 is 23839686.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 1470727 + ... + 1471193.

Almost surely, 2^686938320 is an apocalyptic number.

686938320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686938320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1200740112).

686938320 is an abundant number, since it is smaller than the sum of its proper divisors (1714541904).

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

686938320 is a wasteful number, since it uses less digits than its factorization.

686938320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719 (or 704 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 686938320 is about 26209.5081983619. The cubic root of 686938320 is about 882.3466636730.

The spelling of 686938320 in words is "six hundred eighty-six million, nine hundred thirty-eight thousand, three hundred twenty".