25809672 has 96 divisors (see below), whose sum is σ = 79535520. Its totient is φ = 6935040.

The previous prime is 25809671. The next prime is 25809677. The reversal of 25809672 is 27690852.

It is a happy number.

It is a super-2 number, since 2×25809672² = 1332278337495168, 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 25809672.

It is not an unprimeable number, because it can be changed into a prime (25809671) 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, 19347 + ... + 20637.

It is an arithmetic number, because the mean of its divisors is an integer number (828495).

Almost surely, 2^25809672 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 25809672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39767760).

25809672 is an abundant number, since it is smaller than the sum of its proper divisors (53725848).

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

25809672 is a wasteful number, since it uses less digits than its factorization.

25809672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331 (or 1320 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 25809672 is about 5080.3220370366. The cubic root of 25809672 is about 295.5249563068.

The spelling of 25809672 in words is "twenty-five million, eight hundred nine thousand, six hundred seventy-two".