686393520 has 160 divisors (see below), whose sum is σ = 2194359552. Its totient is φ = 177386496.

The previous prime is 686393473. The next prime is 686393557. The reversal of 686393520 is 25393686.

It is a super-2 number, since 2×686393520² = 942272128595980800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2342494 + ... + 2342786.

Almost surely, 2^686393520 is an apocalyptic number.

686393520 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 686393520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097179776).

686393520 is an abundant number, since it is smaller than the sum of its proper divisors (1507966032).

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

686393520 is a wasteful number, since it uses less digits than its factorization.

686393520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579 (or 573 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 686393520 is about 26199.1129620833. The cubic root of 686393520 is about 882.1133435511.

The spelling of 686393520 in words is "six hundred eighty-six million, three hundred ninety-three thousand, five hundred twenty".