28504819 has 6 divisors (see below), whose sum is σ = 33158724. Its totient is φ = 24432660.

The previous prime is 28504793. The next prime is 28504871. The reversal of 28504819 is 91840582.

It is not a de Polignac number, because 28504819 - 2⁵ = 28504787 is a prime.

It is a super-2 number, since 2×28504819² = 1625049412445522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28504219) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 290817 + ... + 290914.

It is an arithmetic number, because the mean of its divisors is an integer number (5526454).

Almost surely, 2^28504819 is an apocalyptic number.

28504819 is a deficient number, since it is larger than the sum of its proper divisors (4653905).

28504819 is an equidigital number, since it uses as much as digits as its factorization.

28504819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581745 (or 581738 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 28504819 is about 5338.9904476408. The cubic root of 28504819 is about 305.4729525155.

The spelling of 28504819 in words is "twenty-eight million, five hundred four thousand, eight hundred nineteen".