685905790 has 16 divisors (see below), whose sum is σ = 1235190240. Its totient is φ = 274237920.

The previous prime is 685905763. The next prime is 685905797. The reversal of 685905790 is 97509586.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685905797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9535 + ... + 38245.

It is an arithmetic number, because the mean of its divisors is an integer number (77199390).

Almost surely, 2^685905790 is an apocalyptic number.

685905790 is a deficient number, since it is larger than the sum of its proper divisors (549284450).

685905790 is a wasteful number, since it uses less digits than its factorization.

685905790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31107.

The product of its (nonzero) digits is 680400, while the sum is 49.

The square root of 685905790 is about 26189.8031684089. The cubic root of 685905790 is about 881.9043598937.

The spelling of 685905790 in words is "six hundred eighty-five million, nine hundred five thousand, seven hundred ninety".