25821252 has 36 divisors (see below), whose sum is σ = 67523820. Its totient is φ = 8309952.

The previous prime is 25821251. The next prime is 25821269. The reversal of 25821252 is 25212852.

It can be written as a sum of positive squares in 2 ways, for example, as 6320196 + 19501056 = 2514^2 + 4416^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (25821251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11323 + ... + 13410.

Almost surely, 2^25821252 is an apocalyptic number.

It is an amenable number.

25821252 is an abundant number, since it is smaller than the sum of its proper divisors (41702568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25821252 is a wasteful number, since it uses less digits than its factorization.

25821252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24772 (or 24767 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 25821252 is about 5081.4616007602. The cubic root of 25821252 is about 295.5691473284.

Subtracting from 25821252 its reverse (25212852), we obtain a square (608400 = 780²).

It can be divided in two parts, 258 and 21252, that multiplied together give a triangular number (5483016 = T₃₃₁₁).

The spelling of 25821252 in words is "twenty-five million, eight hundred twenty-one thousand, two hundred fifty-two".