25015625 has 14 divisors (see below), whose sum is σ = 31288662. Its totient is φ = 20000000.

The previous prime is 25015607. The next prime is 25015633. The reversal of 25015625 is 52651052.

It can be written as a sum of positive squares in 7 ways, for example, as 22316176 + 2699449 = 4724^2 + 1643^2 .

It is not a de Polignac number, because 25015625 - 2⁶ = 25015561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25015594 and 25015603.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 14825 + ... + 16425.

Almost surely, 2^25015625 is an apocalyptic number.

25015625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25015625 is a deficient number, since it is larger than the sum of its proper divisors (6273037).

25015625 is an frugal number, since it uses more digits than its factorization.

25015625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631 (or 1606 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 25015625 is about 5001.5622559356. The cubic root of 25015625 is about 292.4626781709.

Adding to 25015625 its reverse (52651052), we get a palindrome (77666677).

The spelling of 25015625 in words is "twenty-five million, fifteen thousand, six hundred twenty-five".