684653020 has 24 divisors (see below), whose sum is σ = 1461343968. Its totient is φ = 269371200.

The previous prime is 684652999. The next prime is 684653033. The reversal of 684653020 is 20356486.

It is a happy number.

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, 279376 + ... + 281815.

It is an arithmetic number, because the mean of its divisors is an integer number (60889332).

Almost surely, 2^684653020 is an apocalyptic number.

It is an amenable number.

684653020 is an abundant number, since it is smaller than the sum of its proper divisors (776690948).

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

684653020 is a wasteful number, since it uses less digits than its factorization.

684653020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561261 (or 561259 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 684653020 is about 26165.8751048001. The cubic root of 684653020 is about 881.3671157328.

The spelling of 684653020 in words is "six hundred eighty-four million, six hundred fifty-three thousand, twenty".