685708905 has 16 divisors (see below), whose sum is σ = 1253867904. Its totient is φ = 313466880.

The previous prime is 685708883. The next prime is 685708927. The reversal of 685708905 is 509807586.

It is an interprime number because it is at equal distance from previous prime (685708883) and next prime (685708927).

It is not a de Polignac number, because 685708905 - 2⁸ = 685708649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3265176 + ... + 3265385.

It is an arithmetic number, because the mean of its divisors is an integer number (78366744).

Almost surely, 2^685708905 is an apocalyptic number.

It is an amenable number.

685708905 is a deficient number, since it is larger than the sum of its proper divisors (568158999).

685708905 is a wasteful number, since it uses less digits than its factorization.

685708905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6530576.

The product of its (nonzero) digits is 604800, while the sum is 48.

The square root of 685708905 is about 26186.0440884071. The cubic root of 685708905 is about 881.8199700943.

The spelling of 685708905 in words is "six hundred eighty-five million, seven hundred eight thousand, nine hundred five".