28000089 has 36 divisors (see below), whose sum is σ = 44963100. Its totient is φ = 16773120.

The previous prime is 28000087. The next prime is 28000097. The reversal of 28000089 is 98000082.

It can be written as a sum of positive squares in 6 ways, for example, as 9363600 + 18636489 = 3060^2 + 4317^2 .

It is not a de Polignac number, because 28000089 - 2¹ = 28000087 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28000087) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 62137 + ... + 62585.

It is an arithmetic number, because the mean of its divisors is an integer number (1248975).

Almost surely, 2^28000089 is an apocalyptic number.

It is an amenable number.

28000089 is a deficient number, since it is larger than the sum of its proper divisors (16963011).

28000089 is a wasteful number, since it uses less digits than its factorization.

28000089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 28000089 is about 5291.5110318320. The cubic root of 28000089 is about 303.6592189211.

The spelling of 28000089 in words is "twenty-eight million, eighty-nine", and thus it is an aban number and an uban number.