25521372 has 48 divisors (see below), whose sum is σ = 67173120. Its totient is φ = 8377776.

The previous prime is 25521371. The next prime is 25521407. The reversal of 25521372 is 27312552.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25521371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5473 + ... + 8999.

It is an arithmetic number, because the mean of its divisors is an integer number (1399440).

Almost surely, 2^25521372 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25521372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33586560).

25521372 is an abundant number, since it is smaller than the sum of its proper divisors (41651748).

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

25521372 is a wasteful number, since it uses less digits than its factorization.

25521372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607 (or 3599 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 25521372 is about 5051.8681693013. The cubic root of 25521372 is about 294.4204729136.

The spelling of 25521372 in words is "twenty-five million, five hundred twenty-one thousand, three hundred seventy-two".