684417725 has 12 divisors (see below), whose sum is σ = 849076980. Its totient is φ = 547276800.

The previous prime is 684417703. The next prime is 684417731. The reversal of 684417725 is 527714486.

It can be written as a sum of positive squares in 6 ways, for example, as 98922916 + 585494809 = 9946^2 + 24197^2 .

It is not a de Polignac number, because 684417725 - 2¹⁰ = 684416701 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62135 + ... + 72315.

It is an arithmetic number, because the mean of its divisors is an integer number (70756415).

Almost surely, 2^684417725 is an apocalyptic number.

It is an amenable number.

684417725 is a deficient number, since it is larger than the sum of its proper divisors (164659255).

684417725 is a wasteful number, since it uses less digits than its factorization.

684417725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12880 (or 12875 counting only the distinct ones).

The product of its digits is 376320, while the sum is 44.

The square root of 684417725 is about 26161.3784996127. The cubic root of 684417725 is about 881.2661375580.

The spelling of 684417725 in words is "six hundred eighty-four million, four hundred seventeen thousand, seven hundred twenty-five".