685257216 has 320 divisors, whose sum is σ = 2319280128. Its totient is φ = 175177728.

The previous prime is 685257197. The next prime is 685257241. The reversal of 685257216 is 612752586.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 4203951 + ... + 4204113.

Almost surely, 2^685257216 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 685257216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1159640064).

685257216 is an abundant number, since it is smaller than the sum of its proper divisors (1634022912).

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

685257216 is a wasteful number, since it uses less digits than its factorization.

685257216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 215 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The square root of 685257216 is about 26177.4180544988. The cubic root of 685257216 is about 881.6263039155.

The spelling of 685257216 in words is "six hundred eighty-five million, two hundred fifty-seven thousand, two hundred sixteen".