687568825 has 12 divisors (see below), whose sum is σ = 902737980. Its totient is φ = 517698560.

The previous prime is 687568799. The next prime is 687568829. The reversal of 687568825 is 528865786.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 23785129 + 663783696 = 4877^2 + 25764^2 .

It is not a de Polignac number, because 687568825 - 2⁵ = 687568793 is a prime.

It is a super-2 number, since 2×687568825² = 945501778223761250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (687568829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 808480 + ... + 809329.

It is an arithmetic number, because the mean of its divisors is an integer number (75228165).

Almost surely, 2^687568825 is an apocalyptic number.

It is an amenable number.

687568825 is a deficient number, since it is larger than the sum of its proper divisors (215169155).

687568825 is a wasteful number, since it uses less digits than its factorization.

687568825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617836 (or 1617831 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 55.

The square root of 687568825 is about 26221.5336126627. The cubic root of 687568825 is about 882.6165345123.

The spelling of 687568825 in words is "six hundred eighty-seven million, five hundred sixty-eight thousand, eight hundred twenty-five".