28478819 has 4 divisors (see below), whose sum is σ = 28903944. Its totient is φ = 28053696.

The previous prime is 28478809. The next prime is 28478839. The reversal of 28478819 is 91887482.

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 28478819 - 2⁴ = 28478803 is a prime.

It is a super-2 number, since 2×28478819² = 1622086263269522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28478809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212462 + ... + 212595.

It is an arithmetic number, because the mean of its divisors is an integer number (7225986).

Almost surely, 2^28478819 is an apocalyptic number.

28478819 is a deficient number, since it is larger than the sum of its proper divisors (425125).

28478819 is an equidigital number, since it uses as much as digits as its factorization.

28478819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425124.

The product of its digits is 258048, while the sum is 47.

The square root of 28478819 is about 5336.5549748878. The cubic root of 28478819 is about 305.3800476073.

The spelling of 28478819 in words is "twenty-eight million, four hundred seventy-eight thousand, eight hundred nineteen".