25215228 has 18 divisors (see below), whose sum is σ = 63738584. Its totient is φ = 8405064.

The previous prime is 25215221. The next prime is 25215251. The reversal of 25215228 is 82251252.

It is a tau number, because it is divible by the number of its divisors (18).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25215221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 350176 + ... + 350247.

Almost surely, 2^25215228 is an apocalyptic number.

It is an amenable number.

25215228 is an abundant number, since it is smaller than the sum of its proper divisors (38523356).

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

25215228 is a wasteful number, since it uses less digits than its factorization.

25215228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700433 (or 700428 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 25215228 is about 5021.4766752421. The cubic root of 25215228 is about 293.2384846005.

The spelling of 25215228 in words is "twenty-five million, two hundred fifteen thousand, two hundred twenty-eight".