25987281 has 8 divisors (see below), whose sum is σ = 35217984. Its totient is φ = 17040720.

The previous prime is 25987279. The next prime is 25987289. The reversal of 25987281 is 18278952.

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

It is not a de Polignac number, because 25987281 - 2¹ = 25987279 is a prime.

It is a super-2 number, since 2×25987281² = 1350677547545922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25987289) 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, 70821 + ... + 71186.

It is an arithmetic number, because the mean of its divisors is an integer number (4402248).

Almost surely, 2^25987281 is an apocalyptic number.

It is an amenable number.

25987281 is a deficient number, since it is larger than the sum of its proper divisors (9230703).

25987281 is a wasteful number, since it uses less digits than its factorization.

25987281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142071.

The product of its digits is 80640, while the sum is 42.

The square root of 25987281 is about 5097.7721604638. The cubic root of 25987281 is about 296.2012912851.

The spelling of 25987281 in words is "twenty-five million, nine hundred eighty-seven thousand, two hundred eighty-one".