25428891 has 8 divisors (see below), whose sum is σ = 33929280. Its totient is φ = 16940552.

The previous prime is 25428881. The next prime is 25428917. The reversal of 25428891 is 19882452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25428891 - 2⁷ = 25428763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25428811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4840 + ... + 8618.

It is an arithmetic number, because the mean of its divisors is an integer number (4241160).

Almost surely, 2^25428891 is an apocalyptic number.

25428891 is a deficient number, since it is larger than the sum of its proper divisors (8500389).

25428891 is a wasteful number, since it uses less digits than its factorization.

25428891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6025.

The product of its digits is 46080, while the sum is 39.

The square root of 25428891 is about 5042.7067136608. The cubic root of 25428891 is about 294.0644150587.

The spelling of 25428891 in words is "twenty-five million, four hundred twenty-eight thousand, eight hundred ninety-one".