25601728 has 28 divisors (see below), whose sum is σ = 53794152. Its totient is φ = 12047360.

The previous prime is 25601713. The next prime is 25601729. The reversal of 25601728 is 82710652.

It is a self number, because there is not a number n which added to its sum of digits gives 25601728.

It is not an unprimeable number, because it can be changed into a prime (25601729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10678 + ... + 12853.

Almost surely, 2^25601728 is an apocalyptic number.

It is an amenable number.

25601728 is an abundant number, since it is smaller than the sum of its proper divisors (28192424).

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

25601728 is a wasteful number, since it uses less digits than its factorization.

25601728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23560 (or 23550 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 25601728 is about 5059.8150163815. The cubic root of 25601728 is about 294.7291509987.

The spelling of 25601728 in words is "twenty-five million, six hundred one thousand, seven hundred twenty-eight".