28936819 has 4 divisors (see below), whose sum is σ = 29552544. Its totient is φ = 28321096.

The previous prime is 28936813. The next prime is 28936883. The reversal of 28936819 is 91863982.

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

It is a cyclic number.

It is not a de Polignac number, because 28936819 - 2³ = 28936811 is a prime.

It is a super-2 number, since 2×28936819² = 1674678987677522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28936811) 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, 307792 + ... + 307885.

It is an arithmetic number, because the mean of its divisors is an integer number (7388136).

Almost surely, 2^28936819 is an apocalyptic number.

28936819 is a deficient number, since it is larger than the sum of its proper divisors (615725).

28936819 is an equidigital number, since it uses as much as digits as its factorization.

28936819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615724.

The product of its digits is 186624, while the sum is 46.

The square root of 28936819 is about 5379.2953999571. The cubic root of 28936819 is about 307.0084030422.

The spelling of 28936819 in words is "twenty-eight million, nine hundred thirty-six thousand, eight hundred nineteen".