25991562 has 16 divisors (see below), whose sum is σ = 52050240. Its totient is φ = 8652672.

The previous prime is 25991561. The next prime is 25991591. The reversal of 25991562 is 26519952.

It is a super-2 number, since 2×25991562² = 1351122590399688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25991562.

It is not an unprimeable number, because it can be changed into a prime (25991561) 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 7 ways as a sum of consecutive naturals, for example, 3243 + ... + 7905.

It is an arithmetic number, because the mean of its divisors is an integer number (3253140).

Almost surely, 2^25991562 is an apocalyptic number.

25991562 is an abundant number, since it is smaller than the sum of its proper divisors (26058678).

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

25991562 is a wasteful number, since it uses less digits than its factorization.

25991562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5597.

The product of its digits is 48600, while the sum is 39.

The square root of 25991562 is about 5098.1920324758. The cubic root of 25991562 is about 296.2175552426.

The spelling of 25991562 in words is "twenty-five million, nine hundred ninety-one thousand, five hundred sixty-two".