28889025 has 72 divisors (see below), whose sum is σ = 55558944. Its totient is φ = 13132800.

The previous prime is 28889011. The next prime is 28889027. The reversal of 28889025 is 52098882.

It is not a de Polignac number, because 28889025 - 2⁴ = 28889009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28889027) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 297777 + ... + 297873.

It is an arithmetic number, because the mean of its divisors is an integer number (771652).

Almost surely, 2^28889025 is an apocalyptic number.

28889025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28889025 is a deficient number, since it is larger than the sum of its proper divisors (26669919).

28889025 is a wasteful number, since it uses less digits than its factorization.

28889025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 42.

The square root of 28889025 is about 5374.8511607299. The cubic root of 28889025 is about 306.8392846440.

The spelling of 28889025 in words is "twenty-eight million, eight hundred eighty-nine thousand, twenty-five".