25328281 has 8 divisors (see below), whose sum is σ = 28584000. Its totient is φ = 22231440.

The previous prime is 25328263. The next prime is 25328293. The reversal of 25328281 is 18282352.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25328281 - 2⁹ = 25327769 is a prime.

It is a super-3 number, since 3×25328281³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25328231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39381 + ... + 40018.

It is an arithmetic number, because the mean of its divisors is an integer number (3573000).

Almost surely, 2^25328281 is an apocalyptic number.

It is an amenable number.

25328281 is a deficient number, since it is larger than the sum of its proper divisors (3255719).

25328281 is a wasteful number, since it uses less digits than its factorization.

25328281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79439.

The product of its digits is 7680, while the sum is 31.

The square root of 25328281 is about 5032.7210333973. The cubic root of 25328281 is about 293.6760782153.

The spelling of 25328281 in words is "twenty-five million, three hundred twenty-eight thousand, two hundred eighty-one".