25287279 has 8 divisors (see below), whose sum is σ = 35699760. Its totient is φ = 15866496.

The previous prime is 25287247. The next prime is 25287287. The reversal of 25287279 is 97278252.

It is a happy number.

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

It is not a de Polignac number, because 25287279 - 2⁵ = 25287247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25287279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25287209) 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, 247864 + ... + 247965.

It is an arithmetic number, because the mean of its divisors is an integer number (4462470).

Almost surely, 2^25287279 is an apocalyptic number.

25287279 is a deficient number, since it is larger than the sum of its proper divisors (10412481).

25287279 is a wasteful number, since it uses less digits than its factorization.

25287279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495849.

The product of its digits is 141120, while the sum is 42.

The square root of 25287279 is about 5028.6458415760. The cubic root of 25287279 is about 293.5175227783.

The spelling of 25287279 in words is "twenty-five million, two hundred eighty-seven thousand, two hundred seventy-nine".