25831872 has 168 divisors, whose sum is σ = 84319872. Its totient is φ = 7776000.

The previous prime is 25831867. The next prime is 25831873. The reversal of 25831872 is 27813852.

25831872 is a `hidden beast` number, since 2 + 583 + 1 + 8 + 72 = 666.

It is a super-2 number, since 2×25831872² = 1334571222048768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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 (25831873) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 170997 + ... + 171147.

It is an arithmetic number, because the mean of its divisors is an integer number (501904).

Almost surely, 2^25831872 is an apocalyptic number.

25831872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25831872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42159936).

25831872 is an abundant number, since it is smaller than the sum of its proper divisors (58488000).

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

25831872 is a wasteful number, since it uses less digits than its factorization.

25831872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 167 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 25831872 is about 5082.5064682694. The cubic root of 25831872 is about 295.6096632324.

The spelling of 25831872 in words is "twenty-five million, eight hundred thirty-one thousand, eight hundred seventy-two".