684144125 has 24 divisors (see below), whose sum is σ = 993218616. Its totient is φ = 469123200.

The previous prime is 684144121. The next prime is 684144127. The reversal of 684144125 is 521441486.

It can be written as a sum of positive squares in 4 ways, for example, as 105308644 + 578835481 = 10262^2 + 24059^2 .

It is not a de Polignac number, because 684144125 - 2² = 684144121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684144121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49724 + ... + 61973.

It is an arithmetic number, because the mean of its divisors is an integer number (41384109).

Almost surely, 2^684144125 is an apocalyptic number.

It is an amenable number.

684144125 is a deficient number, since it is larger than the sum of its proper divisors (309074491).

684144125 is a wasteful number, since it uses less digits than its factorization.

684144125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111726 (or 111709 counting only the distinct ones).

The product of its digits is 30720, while the sum is 35.

The square root of 684144125 is about 26156.1488946672. The cubic root of 684144125 is about 881.1486914709.

The spelling of 684144125 in words is "six hundred eighty-four million, one hundred forty-four thousand, one hundred twenty-five".