685615628 has 6 divisors (see below), whose sum is σ = 1199827356. Its totient is φ = 342807812.

The previous prime is 685615537. The next prime is 685615631. The reversal of 685615628 is 826516586.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85701950 + ... + 85701957.

It is an arithmetic number, because the mean of its divisors is an integer number (199971226).

Almost surely, 2^685615628 is an apocalyptic number.

It is an amenable number.

685615628 is a deficient number, since it is larger than the sum of its proper divisors (514211728).

685615628 is a wasteful number, since it uses less digits than its factorization.

685615628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171403911 (or 171403909 counting only the distinct ones).

The product of its digits is 691200, while the sum is 47.

The square root of 685615628 is about 26184.2629837084. The cubic root of 685615628 is about 881.7799836167.

The spelling of 685615628 in words is "six hundred eighty-five million, six hundred fifteen thousand, six hundred twenty-eight".