28778233 has 8 divisors (see below), whose sum is σ = 31706496. Its totient is φ = 25902000.

The previous prime is 28778231. The next prime is 28778273. The reversal of 28778233 is 33287782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28778233 - 2¹ = 28778231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28778231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11841 + ... + 14062.

It is an arithmetic number, because the mean of its divisors is an integer number (3963312).

Almost surely, 2^28778233 is an apocalyptic number.

It is an amenable number.

28778233 is a deficient number, since it is larger than the sum of its proper divisors (2928263).

28778233 is a wasteful number, since it uses less digits than its factorization.

28778233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26015.

The product of its digits is 112896, while the sum is 40.

The square root of 28778233 is about 5364.5347421748. The cubic root of 28778233 is about 306.4465300802.

The spelling of 28778233 in words is "twenty-eight million, seven hundred seventy-eight thousand, two hundred thirty-three".