28489225 has 12 divisors (see below), whose sum is σ = 35600400. Its totient is φ = 22614800.

The previous prime is 28489211. The next prime is 28489231. The reversal of 28489225 is 52298482.

It is a happy number.

It is not a de Polignac number, because 28489225 - 2²¹ = 26392073 is a prime.

It is a super-2 number, since 2×28489225² = 1623271882201250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1075 + ... + 7624.

It is an arithmetic number, because the mean of its divisors is an integer number (2966700).

Almost surely, 2^28489225 is an apocalyptic number.

28489225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28489225 is a deficient number, since it is larger than the sum of its proper divisors (7111175).

28489225 is a wasteful number, since it uses less digits than its factorization.

28489225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8840 (or 8835 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The square root of 28489225 is about 5337.5298594013. The cubic root of 28489225 is about 305.4172377942.

The spelling of 28489225 in words is "twenty-eight million, four hundred eighty-nine thousand, two hundred twenty-five".