685021345 has 8 divisors (see below), whose sum is σ = 865290240. Its totient is φ = 519174000.

The previous prime is 685021321. The next prime is 685021349. The reversal of 685021345 is 543120586.

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

It is not a de Polignac number, because 685021345 - 2⁵ = 685021313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 685021345.

It is not an unprimeable number, because it can be changed into a prime (685021349) 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, 3605281 + ... + 3605470.

It is an arithmetic number, because the mean of its divisors is an integer number (108161280).

Almost surely, 2^685021345 is an apocalyptic number.

It is an amenable number.

685021345 is a deficient number, since it is larger than the sum of its proper divisors (180268895).

685021345 is a wasteful number, since it uses less digits than its factorization.

685021345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7210775.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 685021345 is about 26172.9124286924. The cubic root of 685021345 is about 881.5251380384.

The spelling of 685021345 in words is "six hundred eighty-five million, twenty-one thousand, three hundred forty-five".