15690625 has 12 divisors (see below), whose sum is σ = 19615932. Its totient is φ = 12550000.

The previous prime is 15690613. The next prime is 15690641. The reversal of 15690625 is 52609651.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 9678321 + 6012304 = 3111^2 + 2452^2 .

It is not a de Polignac number, because 15690625 - 2⁹ = 15690113 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 615 + ... + 5635.

It is an arithmetic number, because the mean of its divisors is an integer number (1634661).

Almost surely, 2^15690625 is an apocalyptic number.

It is an amenable number.

15690625 is a deficient number, since it is larger than the sum of its proper divisors (3925307).

15690625 is an frugal number, since it uses more digits than its factorization.

15690625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5046 (or 5026 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 15690625 is about 3961.1393562964. The cubic root of 15690625 is about 250.3495111401.

The spelling of 15690625 in words is "fifteen million, six hundred ninety thousand, six hundred twenty-five".