25991772 has 48 divisors (see below), whose sum is σ = 66057600. Its totient is φ = 7922880.

The previous prime is 25991747. The next prime is 25991789. The reversal of 25991772 is 27719952.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4647 + ... + 8577.

It is an arithmetic number, because the mean of its divisors is an integer number (1376200).

Almost surely, 2^25991772 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 25991772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33028800).

25991772 is an abundant number, since it is smaller than the sum of its proper divisors (40065828).

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

25991772 is a wasteful number, since it uses less digits than its factorization.

25991772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3986 (or 3984 counting only the distinct ones).

The product of its digits is 79380, while the sum is 42.

The square root of 25991772 is about 5098.2126279707. The cubic root of 25991772 is about 296.2183530082.

It can be divided in two parts, 2599 and 1772, that added together give a triangular number (4371 = T₉₃).

The spelling of 25991772 in words is "twenty-five million, nine hundred ninety-one thousand, seven hundred seventy-two".