28385099 has 4 divisors (see below), whose sum is σ = 28401600. Its totient is φ = 28368600.

The previous prime is 28385081. The next prime is 28385111. The reversal of 28385099 is 99058382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99058382 = 2 ⋅49529191.

It is a cyclic number.

It is not a de Polignac number, because 28385099 - 2¹⁶ = 28319563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28385029) 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, 5324 + ... + 9225.

It is an arithmetic number, because the mean of its divisors is an integer number (7100400).

Almost surely, 2^28385099 is an apocalyptic number.

28385099 is a deficient number, since it is larger than the sum of its proper divisors (16501).

28385099 is a wasteful number, since it uses less digits than its factorization.

28385099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16500.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 28385099 is about 5327.7667929443. The cubic root of 28385099 is about 305.0446911131.

The spelling of 28385099 in words is "twenty-eight million, three hundred eighty-five thousand, ninety-nine".