685249308 has 36 divisors (see below), whose sum is σ = 1796314520. Its totient is φ = 228416112.

The previous prime is 685249303. The next prime is 685249309. The reversal of 685249308 is 803942586.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×685249308² = 939133228228957728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685249303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 351523 + ... + 353466.

Almost surely, 2^685249308 is an apocalyptic number.

It is an amenable number.

685249308 is an abundant number, since it is smaller than the sum of its proper divisors (1111065212).

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

685249308 is a wasteful number, since it uses less digits than its factorization.

685249308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705008 (or 704994 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 685249308 is about 26177.2670078448. The cubic root of 685249308 is about 881.6229125235.

The spelling of 685249308 in words is "six hundred eighty-five million, two hundred forty-nine thousand, three hundred eight".