6690625 has 12 divisors (see below), whose sum is σ = 8366652. Its totient is φ = 5350000.

The previous prime is 6690623. The next prime is 6690643. The reversal of 6690625 is 5260966.

It can be written as a sum of positive squares in 6 ways, for example, as 3814209 + 2876416 = 1953^2 + 1696^2 .

It is not a de Polignac number, because 6690625 - 2¹ = 6690623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6690623) 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, 2055 + ... + 4195.

It is an arithmetic number, because the mean of its divisors is an integer number (697221).

Almost surely, 2^6690625 is an apocalyptic number.

It is an amenable number.

6690625 is a deficient number, since it is larger than the sum of its proper divisors (1676027).

6690625 is an frugal number, since it uses more digits than its factorization.

6690625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2166 (or 2146 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 6690625 is about 2586.6242479340. The cubic root of 6690625 is about 188.4323927846.

The spelling of 6690625 in words is "six million, six hundred ninety thousand, six hundred twenty-five".