28545199 has 4 divisors (see below), whose sum is σ = 28557936. Its totient is φ = 28532464.

The previous prime is 28545197. The next prime is 28545211. The reversal of 28545199 is 99154582.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 99154582 = 2 ⋅49577291.

It is a cyclic number.

It is not a de Polignac number, because 28545199 - 2¹ = 28545197 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 (28545197) 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, 2014 + ... + 7819.

It is an arithmetic number, because the mean of its divisors is an integer number (7139484).

Almost surely, 2^28545199 is an apocalyptic number.

28545199 is a deficient number, since it is larger than the sum of its proper divisors (12737).

28545199 is an equidigital number, since it uses as much as digits as its factorization.

28545199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12736.

The product of its digits is 129600, while the sum is 43.

The square root of 28545199 is about 5342.7707231361. The cubic root of 28545199 is about 305.6171290471.

The spelling of 28545199 in words is "twenty-eight million, five hundred forty-five thousand, one hundred ninety-nine".