28889172 has 36 divisors (see below), whose sum is σ = 78644020. Its totient is φ = 8888832.

The previous prime is 28889153. The next prime is 28889207. The reversal of 28889172 is 27198882.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18352656 + 10536516 = 4284^2 + 3246^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30397 + ... + 31332.

Almost surely, 2^28889172 is an apocalyptic number.

It is an amenable number.

28889172 is an abundant number, since it is smaller than the sum of its proper divisors (49754848).

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

28889172 is a wasteful number, since it uses less digits than its factorization.

28889172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61752 (or 61747 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 28889172 is about 5374.8648355098. The cubic root of 28889172 is about 306.8398050873.

The spelling of 28889172 in words is "twenty-eight million, eight hundred eighty-nine thousand, one hundred seventy-two".