28537189 has 8 divisors (see below), whose sum is σ = 30242520. Its totient is φ = 26880000.

The previous prime is 28537177. The next prime is 28537199. The reversal of 28537189 is 98173582.

It can be written as a sum of positive squares in 4 ways, for example, as 225 + 28536964 = 15^2 + 5342^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28537189 - 2¹¹ = 28535141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28537129) 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, 10812 + ... + 13189.

It is an arithmetic number, because the mean of its divisors is an integer number (3780315).

Almost surely, 2^28537189 is an apocalyptic number.

28537189 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28537189 is a deficient number, since it is larger than the sum of its proper divisors (1705331).

28537189 is a wasteful number, since it uses less digits than its factorization.

28537189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24071.

The product of its digits is 120960, while the sum is 43.

The square root of 28537189 is about 5342.0210594868. The cubic root of 28537189 is about 305.5885402090.

The spelling of 28537189 in words is "twenty-eight million, five hundred thirty-seven thousand, one hundred eighty-nine".