684597966 has 16 divisors (see below), whose sum is σ = 1474518864. Its totient is φ = 210645504.

The previous prime is 684597959. The next prime is 684597989. The reversal of 684597966 is 669795486.

It is a congruent number.

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, 4388371 + ... + 4388526.

It is an arithmetic number, because the mean of its divisors is an integer number (92157429).

Almost surely, 2^684597966 is an apocalyptic number.

684597966 is an abundant number, since it is smaller than the sum of its proper divisors (789920898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684597966 is a wasteful number, since it uses less digits than its factorization.

684597966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8776915.

The product of its digits is 19595520, while the sum is 60.

The square root of 684597966 is about 26164.8230645651. The cubic root of 684597966 is about 881.3434910722.

The spelling of 684597966 in words is "six hundred eighty-four million, five hundred ninety-seven thousand, nine hundred sixty-six".