684206725 has 12 divisors (see below), whose sum is σ = 849810564. Its totient is φ = 546465920.

The previous prime is 684206711. The next prime is 684206749. The reversal of 684206725 is 527602486.

It can be written as a sum of positive squares in 6 ways, for example, as 21967969 + 662238756 = 4687^2 + 25734^2 .

It is not a de Polignac number, because 684206725 - 2¹⁵ = 684173957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6754 + ... + 37603.

It is an arithmetic number, because the mean of its divisors is an integer number (70817547).

Almost surely, 2^684206725 is an apocalyptic number.

It is an amenable number.

684206725 is a deficient number, since it is larger than the sum of its proper divisors (165603839).

684206725 is a wasteful number, since it uses less digits than its factorization.

684206725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44984 (or 44979 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 684206725 is about 26157.3455266394. The cubic root of 684206725 is about 881.1755660352.

The spelling of 684206725 in words is "six hundred eighty-four million, two hundred six thousand, seven hundred twenty-five".