685202990 has 32 divisors (see below), whose sum is σ = 1268460000. Its totient is φ = 266387968.

The previous prime is 685202983. The next prime is 685202993. The reversal of 685202990 is 99202586.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685202993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45986 + ... + 59034.

It is an arithmetic number, because the mean of its divisors is an integer number (39639375).

Almost surely, 2^685202990 is an apocalyptic number.

685202990 is a deficient number, since it is larger than the sum of its proper divisors (583257010).

685202990 is a wasteful number, since it uses less digits than its factorization.

685202990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13204.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 685202990 is about 26176.3822939687. The cubic root of 685202990 is about 881.6030482543.

The spelling of 685202990 in words is "six hundred eighty-five million, two hundred two thousand, nine hundred ninety".