25128257 has 16 divisors (see below), whose sum is σ = 31460352. Its totient is φ = 19498320.

The previous prime is 25128223. The next prime is 25128263. The reversal of 25128257 is 75282152.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25128257 - 2¹⁶ = 25062721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25128287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23108 + ... + 24170.

It is an arithmetic number, because the mean of its divisors is an integer number (1966272).

Almost surely, 2^25128257 is an apocalyptic number.

It is an amenable number.

25128257 is a deficient number, since it is larger than the sum of its proper divisors (6332095).

25128257 is a wasteful number, since it uses less digits than its factorization.

25128257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388.

The product of its digits is 11200, while the sum is 32.

The square root of 25128257 is about 5012.8092922033. The cubic root of 25128257 is about 292.9009554689.

The spelling of 25128257 in words is "twenty-five million, one hundred twenty-eight thousand, two hundred fifty-seven".