687565625 has 12 divisors (see below), whose sum is σ = 859405932. Its totient is φ = 550050000.

The previous prime is 687565621. The next prime is 687565631. The reversal of 687565625 is 526565786.

It can be written as a sum of positive squares in 6 ways, for example, as 482417296 + 205148329 = 21964^2 + 14323^2 .

It is not a de Polignac number, because 687565625 - 2² = 687565621 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687565621) 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, 106886 + ... + 113135.

It is an arithmetic number, because the mean of its divisors is an integer number (71617161).

Almost surely, 2^687565625 is an apocalyptic number.

It is an amenable number.

687565625 is a deficient number, since it is larger than the sum of its proper divisors (171840307).

687565625 is an frugal number, since it uses more digits than its factorization.

687565625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220046 (or 220026 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 50.

The square root of 687565625 is about 26221.4725940402. The cubic root of 687565625 is about 882.6151652543.

The spelling of 687565625 in words is "six hundred eighty-seven million, five hundred sixty-five thousand, six hundred twenty-five".