15625625 has 20 divisors (see below), whose sum is σ = 20393472. Its totient is φ = 11946000.

The previous prime is 15625607. The next prime is 15625627. The reversal of 15625625 is 52652651.

It is not a de Polignac number, because 15625625 - 2¹⁶ = 15560089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15625591 and 15625600.

It is not an unprimeable number, because it can be changed into a prime (15625627) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13832 + ... + 14918.

Almost surely, 2^15625625 is an apocalyptic number.

It is an amenable number.

15625625 is a deficient number, since it is larger than the sum of its proper divisors (4767847).

15625625 is an equidigital number, since it uses as much as digits as its factorization.

15625625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130 (or 1115 counting only the distinct ones).

The product of its digits is 18000, while the sum is 32.

The square root of 15625625 is about 3952.9261313614. The cubic root of 15625625 is about 250.0033332889.

It can be divided in two parts, 15625 and 625, that multiplied together give a 10-th power (9765625 = 5¹⁰).

The spelling of 15625625 in words is "fifteen million, six hundred twenty-five thousand, six hundred twenty-five".