685898990 has 16 divisors (see below), whose sum is σ = 1410992352. Its totient is φ = 235165344.

The previous prime is 685898951. The next prime is 685899047. The reversal of 685898990 is 99898586.

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 7 ways as a sum of consecutive naturals, for example, 4899209 + ... + 4899348.

It is an arithmetic number, because the mean of its divisors is an integer number (88187022).

Almost surely, 2^685898990 is an apocalyptic number.

685898990 is an abundant number, since it is smaller than the sum of its proper divisors (725093362).

685898990 is a wasteful number, since it uses less digits than its factorization.

685898990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9798571.

The product of its (nonzero) digits is 11197440, while the sum is 62.

The square root of 685898990 is about 26189.6733465693. The cubic root of 685898990 is about 881.9014455141.

The spelling of 685898990 in words is "six hundred eighty-five million, eight hundred ninety-eight thousand, nine hundred ninety".