687044125 has 8 divisors (see below), whose sum is σ = 857431224. Its totient is φ = 549635200.

The previous prime is 687044107. The next prime is 687044129. The reversal of 687044125 is 521440786.

It can be written as a sum of positive squares in 4 ways, for example, as 211237156 + 475806969 = 14534^2 + 21813^2 .

It is not a de Polignac number, because 687044125 - 2⁷ = 687043997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687044129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2748052 + ... + 2748301.

It is an arithmetic number, because the mean of its divisors is an integer number (107178903).

Almost surely, 2^687044125 is an apocalyptic number.

It is an amenable number.

687044125 is a deficient number, since it is larger than the sum of its proper divisors (170387099).

687044125 is an equidigital number, since it uses as much as digits as its factorization.

687044125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5496368 (or 5496358 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 687044125 is about 26211.5265675237. The cubic root of 687044125 is about 882.3919622068.

The spelling of 687044125 in words is "six hundred eighty-seven million, forty-four thousand, one hundred twenty-five".