685233690 has 32 divisors (see below), whose sum is σ = 1645902720. Its totient is φ = 182579904.

The previous prime is 685233677. The next prime is 685233691. The reversal of 685233690 is 96332586.

It is a super-2 number, since 2×685233690² = 939090419822032200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (685233691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30912 + ... + 48228.

It is an arithmetic number, because the mean of its divisors is an integer number (51434460).

Almost surely, 2^685233690 is an apocalyptic number.

685233690 is an abundant number, since it is smaller than the sum of its proper divisors (960669030).

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

685233690 is a wasteful number, since it uses less digits than its factorization.

685233690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18646.

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

The square root of 685233690 is about 26176.9686938729. The cubic root of 685233690 is about 881.6162145762.

The spelling of 685233690 in words is "six hundred eighty-five million, two hundred thirty-three thousand, six hundred ninety".