685956990 has 16 divisors (see below), whose sum is σ = 1646296848. Its totient is φ = 182921856.

The previous prime is 685956977. The next prime is 685957001. The reversal of 685956990 is 99659586.

It is a self number, because there is not a number n which added to its sum of digits gives 685956990.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11432587 + ... + 11432646.

It is an arithmetic number, because the mean of its divisors is an integer number (102893553).

Almost surely, 2^685956990 is an apocalyptic number.

685956990 is an abundant number, since it is smaller than the sum of its proper divisors (960339858).

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

685956990 is a wasteful number, since it uses less digits than its factorization.

685956990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22865243.

The product of its (nonzero) digits is 5248800, while the sum is 57.

The square root of 685956990 is about 26190.7806298323. The cubic root of 685956990 is about 881.9263028390.

The spelling of 685956990 in words is "six hundred eighty-five million, nine hundred fifty-six thousand, nine hundred ninety".