28917819 has 12 divisors (see below), whose sum is σ = 47737456. Its totient is φ = 16524432.

The previous prime is 28917797. The next prime is 28917821. The reversal of 28917819 is 91871982.

It is not a de Polignac number, because 28917819 - 2⁹ = 28917307 is a prime.

It is a super-2 number, since 2×28917819² = 1672480511433522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28917839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229444 + ... + 229569.

Almost surely, 2^28917819 is an apocalyptic number.

28917819 is a deficient number, since it is larger than the sum of its proper divisors (18819637).

28917819 is a wasteful number, since it uses less digits than its factorization.

28917819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459026 (or 459023 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 28917819 is about 5377.5290794193. The cubic root of 28917819 is about 306.9411941250.

The spelling of 28917819 in words is "twenty-eight million, nine hundred seventeen thousand, eight hundred nineteen".