28691199 has 16 divisors (see below), whose sum is σ = 42588000. Its totient is φ = 19090368.

The previous prime is 28691183. The next prime is 28691207. The reversal of 28691199 is 99119682.

It is not a de Polignac number, because 28691199 - 2⁴ = 28691183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28691099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26827 + ... + 27875.

It is an arithmetic number, because the mean of its divisors is an integer number (2661750).

Almost surely, 2^28691199 is an apocalyptic number.

28691199 is a deficient number, since it is larger than the sum of its proper divisors (13896801).

28691199 is a wasteful number, since it uses less digits than its factorization.

28691199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071 (or 2065 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 28691199 is about 5356.4166193454. The cubic root of 28691199 is about 306.1372894136.

The spelling of 28691199 in words is "twenty-eight million, six hundred ninety-one thousand, one hundred ninety-nine".