28988273 has 4 divisors (see below), whose sum is σ = 29026548. Its totient is φ = 28950000.

The previous prime is 28988269. The next prime is 28988291. The reversal of 28988273 is 37288982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5678689 + 23309584 = 2383^2 + 4828^2 .

It is a cyclic number.

It is not a de Polignac number, because 28988273 - 2² = 28988269 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28988233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17978 + ... + 19523.

It is an arithmetic number, because the mean of its divisors is an integer number (7256637).

Almost surely, 2^28988273 is an apocalyptic number.

It is an amenable number.

28988273 is a deficient number, since it is larger than the sum of its proper divisors (38275).

28988273 is an equidigital number, since it uses as much as digits as its factorization.

28988273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38274.

The product of its digits is 387072, while the sum is 47.

The square root of 28988273 is about 5384.0758724223. The cubic root of 28988273 is about 307.1902642732.

The spelling of 28988273 in words is "twenty-eight million, nine hundred eighty-eight thousand, two hundred seventy-three".