28813919 has 2 divisors, whose sum is σ = 28813920. Its totient is φ = 28813918.

The previous prime is 28813909. The next prime is 28813931. The reversal of 28813919 is 91931882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28813919 - 2¹⁶ = 28748383 is a prime.

It is a super-2 number, since 2×28813919² = 1660483856277122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28813909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14406959 + 14406960.

It is an arithmetic number, because the mean of its divisors is an integer number (14406960).

Almost surely, 2^28813919 is an apocalyptic number.

28813919 is a deficient number, since it is larger than the sum of its proper divisors (1).

28813919 is an equidigital number, since it uses as much as digits as its factorization.

28813919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The square root of 28813919 is about 5367.8598156062. The cubic root of 28813919 is about 306.5731458422.

The spelling of 28813919 in words is "twenty-eight million, eight hundred thirteen thousand, nine hundred nineteen".