28749189 has 8 divisors (see below), whose sum is σ = 43808320. Its totient is φ = 16428096.

The previous prime is 28749187. The next prime is 28749197. The reversal of 28749189 is 98194782.

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

It is not a de Polignac number, because 28749189 - 2¹ = 28749187 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28749181) 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, 684484 + ... + 684525.

It is an arithmetic number, because the mean of its divisors is an integer number (5476040).

Almost surely, 2^28749189 is an apocalyptic number.

It is an amenable number.

28749189 is a deficient number, since it is larger than the sum of its proper divisors (15059131).

28749189 is a wasteful number, since it uses less digits than its factorization.

28749189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369019.

The product of its digits is 290304, while the sum is 48.

The square root of 28749189 is about 5361.8270207085. The cubic root of 28749189 is about 306.3434031913.

It can be divided in two parts, 28749 and 189, that multiplied together give a square (5433561 = 2331²).

The spelling of 28749189 in words is "twenty-eight million, seven hundred forty-nine thousand, one hundred eighty-nine".