686555496 has 96 divisors (see below), whose sum is σ = 2078032320. Its totient is φ = 202963200.

The previous prime is 686555431. The next prime is 686555521. The reversal of 686555496 is 694555686.

686555496 is a `hidden beast` number, since 6 + 86 + 5 + 554 + 9 + 6 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21901 + ... + 43043.

It is an arithmetic number, because the mean of its divisors is an integer number (21646170).

Almost surely, 2^686555496 is an apocalyptic number.

686555496 is a gapful number since it is divisible by the number (66) 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 686555496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1039016160).

686555496 is an abundant number, since it is smaller than the sum of its proper divisors (1391476824).

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

686555496 is a wasteful number, since it uses less digits than its factorization.

686555496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21207 (or 21200 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 54.

The square root of 686555496 is about 26202.2040294323. The cubic root of 686555496 is about 882.1827254966.

The spelling of 686555496 in words is "six hundred eighty-six million, five hundred fifty-five thousand, four hundred ninety-six".