25621025 has 12 divisors (see below), whose sum is σ = 33442800. Its totient is φ = 19417680.

The previous prime is 25621019. The next prime is 25621033. The reversal of 25621025 is 52012652.

It is not a de Polignac number, because 25621025 - 2⁸ = 25620769 is a prime.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 26495 + ... + 27444.

It is an arithmetic number, because the mean of its divisors is an integer number (2786900).

Almost surely, 2^25621025 is an apocalyptic number.

25621025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25621025 is a deficient number, since it is larger than the sum of its proper divisors (7821775).

25621025 is a wasteful number, since it uses less digits than its factorization.

25621025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53968 (or 53963 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 25621025 is about 5061.7215450872. The cubic root of 25621025 is about 294.8031819403.

Adding to 25621025 its reverse (52012652), we get a palindrome (77633677).

It can be divided in two parts, 256 and 21025, that multiplied together give a square (5382400 = 2320²).

The spelling of 25621025 in words is "twenty-five million, six hundred twenty-one thousand, twenty-five".