25128315 has 36 divisors (see below), whose sum is σ = 44894304. Its totient is φ = 12996288.

The previous prime is 25128293. The next prime is 25128319. The reversal of 25128315 is 51382152.

It is a happy number.

It is not a de Polignac number, because 25128315 - 2¹⁵ = 25095547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25128319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 230481 + ... + 230589.

It is an arithmetic number, because the mean of its divisors is an integer number (1247064).

Almost surely, 2^25128315 is an apocalyptic number.

25128315 is a deficient number, since it is larger than the sum of its proper divisors (19765989).

25128315 is a wasteful number, since it uses less digits than its factorization.

25128315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 164 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 25128315 is about 5012.8150773792. The cubic root of 25128315 is about 292.9011808226.

The spelling of 25128315 in words is "twenty-five million, one hundred twenty-eight thousand, three hundred fifteen".