25525278 has 48 divisors (see below), whose sum is σ = 57872880. Its totient is φ = 8120448.

The previous prime is 25525243. The next prime is 25525319. The reversal of 25525278 is 87252552.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55626 + ... + 56082.

It is an arithmetic number, because the mean of its divisors is an integer number (1205685).

Almost surely, 2^25525278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25525278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28936440).

25525278 is an abundant number, since it is smaller than the sum of its proper divisors (32347602).

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

25525278 is a wasteful number, since it uses less digits than its factorization.

25525278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601 (or 598 counting only the distinct ones).

The product of its digits is 56000, while the sum is 36.

The square root of 25525278 is about 5052.2547441712. The cubic root of 25525278 is about 294.4354923217.

The spelling of 25525278 in words is "twenty-five million, five hundred twenty-five thousand, two hundred seventy-eight".