685398672 has 300 divisors, whose sum is σ = 2370692016. Its totient is φ = 190512000.

The previous prime is 685398667. The next prime is 685398709. The reversal of 685398672 is 276893586.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 59 ways as a sum of consecutive naturals, for example, 2730547 + ... + 2730797.

Almost surely, 2^685398672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685398672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1185346008).

685398672 is an abundant number, since it is smaller than the sum of its proper divisors (1685293344).

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

685398672 is a wasteful number, since it uses less digits than its factorization.

685398672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 306 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 685398672 is about 26180.1197858222. The cubic root of 685398672 is about 881.6869637414.

The spelling of 685398672 in words is "six hundred eighty-five million, three hundred ninety-eight thousand, six hundred seventy-two".