25721472 has 96 divisors (see below), whose sum is σ = 79535520. Its totient is φ = 7343616.

The previous prime is 25721461. The next prime is 25721503. The reversal of 25721472 is 27412752.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18133 + ... + 19499.

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

Almost surely, 2^25721472 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 25721472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39767760).

25721472 is an abundant number, since it is smaller than the sum of its proper divisors (53814048).

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

25721472 is a wasteful number, since it uses less digits than its factorization.

25721472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398 (or 1379 counting only the distinct ones).

The product of its digits is 7840, while the sum is 30.

The square root of 25721472 is about 5071.6340561992. The cubic root of 25721472 is about 295.1879373160.

The spelling of 25721472 in words is "twenty-five million, seven hundred twenty-one thousand, four hundred seventy-two".