25820525 has 18 divisors (see below), whose sum is σ = 33803082. Its totient is φ = 19562400.

The previous prime is 25820521. The next prime is 25820537. The reversal of 25820525 is 52502852.

It can be written as a sum of positive squares in 3 ways, for example, as 1976836 + 23843689 = 1406^2 + 4883^2 .

It is not a de Polignac number, because 25820525 - 2² = 25820521 is a prime.

It is a super-2 number, since 2×25820525² = 1333399022551250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25820521) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7595 + ... + 10455.

It is an arithmetic number, because the mean of its divisors is an integer number (1877949).

Almost surely, 2^25820525 is an apocalyptic number.

25820525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25820525 is a deficient number, since it is larger than the sum of its proper divisors (7982557).

25820525 is a wasteful number, since it uses less digits than its factorization.

25820525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909 (or 2885 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 25820525 is about 5081.3900657202. The cubic root of 25820525 is about 295.5663733758.

The spelling of 25820525 in words is "twenty-five million, eight hundred twenty thousand, five hundred twenty-five".