28033278 has 32 divisors (see below), whose sum is σ = 69006336. Its totient is φ = 7393248.

The previous prime is 28033277. The next prime is 28033279. The reversal of 28033278 is 87233082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28033277) and next prime (28033279).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28033277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25126 + ... + 26217.

It is an arithmetic number, because the mean of its divisors is an integer number (2156448).

Almost surely, 2^28033278 is an apocalyptic number.

28033278 is an abundant number, since it is smaller than the sum of its proper divisors (40973058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28033278 is a wasteful number, since it uses less digits than its factorization.

28033278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51368.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 28033278 is about 5294.6461638149. The cubic root of 28033278 is about 303.7791490934.

The spelling of 28033278 in words is "twenty-eight million, thirty-three thousand, two hundred seventy-eight".