25297278 has 16 divisors (see below), whose sum is σ = 50851200. Its totient is φ = 8389656.

The previous prime is 25297277. The next prime is 25297289. The reversal of 25297278 is 87279252.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25297273) 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, 9400 + ... + 11787.

It is an arithmetic number, because the mean of its divisors is an integer number (3178200).

Almost surely, 2^25297278 is an apocalyptic number.

25297278 is an abundant number, since it is smaller than the sum of its proper divisors (25553922).

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

25297278 is a wasteful number, since it uses less digits than its factorization.

25297278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21391.

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

The square root of 25297278 is about 5029.6399473521. The cubic root of 25297278 is about 293.5562048756.

The spelling of 25297278 in words is "twenty-five million, two hundred ninety-seven thousand, two hundred seventy-eight".