25390625 has 20 divisors (see below), whose sum is σ = 34179684. Its totient is φ = 18750000.

The previous prime is 25390601. The next prime is 25390627. The reversal of 25390625 is 52609352.

It can be written as a sum of positive squares in 10 ways, for example, as 59536 + 25331089 = 244^2 + 5033^2 .

It is not a de Polignac number, because 25390625 - 2⁸ = 25390369 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 = 25390591 and 25390600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25390627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1953119 + ... + 1953131.

Almost surely, 2^25390625 is an apocalyptic number.

25390625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25390625 is a deficient number, since it is larger than the sum of its proper divisors (8789059).

25390625 is an frugal number, since it uses more digits than its factorization.

25390625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58 (or 18 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 25390625 is about 5038.9110926866. The cubic root of 25390625 is about 293.9168359651.

Adding to 25390625 its reverse (52609352), we get a palindrome (77999977).

It can be divided in two parts, 25 and 390625, that multiplied together give a 10-th power (9765625 = 5¹⁰).

The spelling of 25390625 in words is "twenty-five million, three hundred ninety thousand, six hundred twenty-five".