28042819 has 12 divisors (see below), whose sum is σ = 33507376. Its totient is φ = 22988592.

The previous prime is 28042813. The next prime is 28042823. The reversal of 28042819 is 91824082.

It is not a de Polignac number, because 28042819 - 2⁵ = 28042787 is a prime.

It is a super-2 number, since 2×28042819² = 1572799394933522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28042813) 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, 84 + ... + 7489.

Almost surely, 2^28042819 is an apocalyptic number.

28042819 is a deficient number, since it is larger than the sum of its proper divisors (5464557).

28042819 is an equidigital number, since it uses as much as digits as its factorization.

28042819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7626 (or 7603 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 28042819 is about 5295.5470916611. The cubic root of 28042819 is about 303.8136084731.

The spelling of 28042819 in words is "twenty-eight million, forty-two thousand, eight hundred nineteen".