685728634 has 8 divisors (see below), whose sum is σ = 1028813940. Its totient is φ = 342790656.

The previous prime is 685728623. The next prime is 685728661. The reversal of 685728634 is 436827586.

It can be written as a sum of positive squares in 2 ways, for example, as 627252025 + 58476609 = 25045^2 + 7647^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24349 + ... + 44320.

Almost surely, 2^685728634 is an apocalyptic number.

685728634 is a deficient number, since it is larger than the sum of its proper divisors (343085306).

685728634 is a wasteful number, since it uses less digits than its factorization.

685728634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73664.

The product of its digits is 1935360, while the sum is 49.

The square root of 685728634 is about 26186.4207939917. The cubic root of 685728634 is about 881.8284271617.

The spelling of 685728634 in words is "six hundred eighty-five million, seven hundred twenty-eight thousand, six hundred thirty-four".