685515712 has 42 divisors (see below), whose sum is σ = 1555909512. Its totient is φ = 293554944.

The previous prime is 685515697. The next prime is 685515737. The reversal of 685515712 is 217515586.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 553558 + ... + 554794.

Almost surely, 2^685515712 is an apocalyptic number.

It is an amenable number.

685515712 is an abundant number, since it is smaller than the sum of its proper divisors (870393800).

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

685515712 is an frugal number, since it uses more digits than its factorization.

685515712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2493 (or 1246 counting only the distinct ones).

The product of its digits is 84000, while the sum is 40.

The square root of 685515712 is about 26182.3549742952. The cubic root of 685515712 is about 881.7371470742.

The spelling of 685515712 in words is "six hundred eighty-five million, five hundred fifteen thousand, seven hundred twelve".