684545720 has 32 divisors (see below), whose sum is σ = 1589915520. Its totient is φ = 264984960.

The previous prime is 684545713. The next prime is 684545731. The reversal of 684545720 is 27545486.

684545720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 274787 + ... + 277266.

It is an arithmetic number, because the mean of its divisors is an integer number (49684860).

Almost surely, 2^684545720 is an apocalyptic number.

It is an amenable number.

684545720 is an abundant number, since it is smaller than the sum of its proper divisors (905369800).

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

684545720 is a wasteful number, since it uses less digits than its factorization.

684545720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552095 (or 552091 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 41.

The square root of 684545720 is about 26163.8246439621. The cubic root of 684545720 is about 881.3210702034.

The spelling of 684545720 in words is "six hundred eighty-four million, five hundred forty-five thousand, seven hundred twenty".