28278083 has 4 divisors (see below), whose sum is σ = 28665528. Its totient is φ = 27890640.

The previous prime is 28278073. The next prime is 28278091. The reversal of 28278083 is 38087282.

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 28278083 - 2⁸ = 28277827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28278013) 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, 193613 + ... + 193758.

It is an arithmetic number, because the mean of its divisors is an integer number (7166382).

Almost surely, 2^28278083 is an apocalyptic number.

28278083 is a deficient number, since it is larger than the sum of its proper divisors (387445).

28278083 is an equidigital number, since it uses as much as digits as its factorization.

28278083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387444.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 28278083 is about 5317.7140765558. The cubic root of 28278083 is about 304.6608538766.

The spelling of 28278083 in words is "twenty-eight million, two hundred seventy-eight thousand, eighty-three".