25128705 has 32 divisors (see below), whose sum is σ = 46483200. Its totient is φ = 11354112.

The previous prime is 25128671. The next prime is 25128707. The reversal of 25128705 is 50782152.

It is not a de Polignac number, because 25128705 - 2⁷ = 25128577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25128707) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8001 + ... + 10689.

It is an arithmetic number, because the mean of its divisors is an integer number (1452600).

Almost surely, 2^25128705 is an apocalyptic number.

It is an amenable number.

25128705 is a deficient number, since it is larger than the sum of its proper divisors (21354495).

25128705 is a wasteful number, since it uses less digits than its factorization.

25128705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2793.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 25128705 is about 5012.8539775262. The cubic root of 25128705 is about 292.9026961235.

The spelling of 25128705 in words is "twenty-five million, one hundred twenty-eight thousand, seven hundred five".