28919419 has 4 divisors (see below), whose sum is σ = 29081160. Its totient is φ = 28757680.

The previous prime is 28919399. The next prime is 28919447. The reversal of 28919419 is 91491982.

It is a happy number.

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 28919419 - 2⁹ = 28918907 is a prime.

It is a super-2 number, since 2×28919419² = 1672665590595122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28919479) 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, 80602 + ... + 80959.

It is an arithmetic number, because the mean of its divisors is an integer number (7270290).

Almost surely, 2^28919419 is an apocalyptic number.

28919419 is a deficient number, since it is larger than the sum of its proper divisors (161741).

28919419 is a wasteful number, since it uses less digits than its factorization.

28919419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161740.

The product of its digits is 46656, while the sum is 43.

The square root of 28919419 is about 5377.6778445719. The cubic root of 28919419 is about 306.9468549583.

The spelling of 28919419 in words is "twenty-eight million, nine hundred nineteen thousand, four hundred nineteen".