25531992 has 48 divisors (see below), whose sum is σ = 69853680. Its totient is φ = 8424000.

The previous prime is 25531973. The next prime is 25531993. The reversal of 25531992 is 29913552.

It is a happy number.

25531992 is a `hidden beast` number, since 2 + 553 + 19 + 92 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25531993) 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 11 ways as a sum of consecutive naturals, for example, 5517 + ... + 9027.

It is an arithmetic number, because the mean of its divisors is an integer number (1455285).

Almost surely, 2^25531992 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 25531992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34926840).

25531992 is an abundant number, since it is smaller than the sum of its proper divisors (44321688).

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

25531992 is a wasteful number, since it uses less digits than its factorization.

25531992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3624 (or 3617 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 25531992 is about 5052.9191562898. The cubic root of 25531992 is about 294.4613055123.

The spelling of 25531992 in words is "twenty-five million, five hundred thirty-one thousand, nine hundred ninety-two".