685291745 has 8 divisors (see below), whose sum is σ = 834624384. Its totient is φ = 540050544.

The previous prime is 685291699. The next prime is 685291759. The reversal of 685291745 is 547192586.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685291745 - 2²² = 681097441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 685291745.

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, 1022489 + ... + 1023158.

It is an arithmetic number, because the mean of its divisors is an integer number (104328048).

Almost surely, 2^685291745 is an apocalyptic number.

It is an amenable number.

685291745 is a deficient number, since it is larger than the sum of its proper divisors (149332639).

685291745 is a wasteful number, since it uses less digits than its factorization.

685291745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045719.

The product of its digits is 604800, while the sum is 47.

The square root of 685291745 is about 26178.0775650161. The cubic root of 685291745 is about 881.6411115735.

The spelling of 685291745 in words is "six hundred eighty-five million, two hundred ninety-one thousand, seven hundred forty-five".