685917900 has 108 divisors (see below), whose sum is σ = 2166054072. Its totient is φ = 181543680.

The previous prime is 685917871. The next prime is 685917919. The reversal of 685917900 is 9719586.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 120519 + ... + 126081.

Almost surely, 2^685917900 is an apocalyptic number.

685917900 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 685917900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1083027036).

685917900 is an abundant number, since it is smaller than the sum of its proper divisors (1480136172).

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

685917900 is a wasteful number, since it uses less digits than its factorization.

685917900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5720 (or 5710 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 685917900 is about 26190.0343642386. The cubic root of 685917900 is about 881.9095500131.

The spelling of 685917900 in words is "six hundred eighty-five million, nine hundred seventeen thousand, nine hundred".