686992320 has 448 divisors, whose sum is σ = 2853903360. Its totient is φ = 152285184.

The previous prime is 686992301. The next prime is 686992331. The reversal of 686992320 is 23299686.

It is a tau number, because it is divible by the number of its divisors (448).

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 63 ways as a sum of consecutive naturals, for example, 2237607 + ... + 2237913.

It is an arithmetic number, because the mean of its divisors is an integer number (6370320).

Almost surely, 2^686992320 is an apocalyptic number.

686992320 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 686992320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1426951680).

686992320 is an abundant number, since it is smaller than the sum of its proper divisors (2166911040).

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

686992320 is a wasteful number, since it uses less digits than its factorization.

686992320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 686992320 is about 26210.5383386149. The cubic root of 686992320 is about 882.3697833962.

The spelling of 686992320 in words is "six hundred eighty-six million, nine hundred ninety-two thousand, three hundred twenty".