684478572 has 48 divisors (see below), whose sum is σ = 1696947840. Its totient is φ = 214123392.

The previous prime is 684478549. The next prime is 684478579. The reversal of 684478572 is 275874486.

It is not an unprimeable number, because it can be changed into a prime (684478579) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10368 + ... + 38424.

It is an arithmetic number, because the mean of its divisors is an integer number (35353080).

Almost surely, 2^684478572 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 684478572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (848473920).

684478572 is an abundant number, since it is smaller than the sum of its proper divisors (1012469268).

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

684478572 is a wasteful number, since it uses less digits than its factorization.

684478572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28190 (or 28188 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 51.

The square root of 684478572 is about 26162.5413903160. The cubic root of 684478572 is about 881.2922526092.

The spelling of 684478572 in words is "six hundred eighty-four million, four hundred seventy-eight thousand, five hundred seventy-two".