28233128 has 32 divisors (see below), whose sum is σ = 66000960. Its totient is φ = 10999680.

The previous prime is 28233119. The next prime is 28233131. The reversal of 28233128 is 82133282.

It is a self number, because there is not a number n which added to its sum of digits gives 28233128.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22301 + ... + 23532.

It is an arithmetic number, because the mean of its divisors is an integer number (2062530).

Almost surely, 2^28233128 is an apocalyptic number.

28233128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28233128 is an abundant number, since it is smaller than the sum of its proper divisors (37767832).

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

28233128 is a wasteful number, since it uses less digits than its factorization.

28233128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45857 (or 45853 counting only the distinct ones).

The product of its digits is 4608, while the sum is 29.

The square root of 28233128 is about 5313.4854850653. The cubic root of 28233128 is about 304.4993236809.

The spelling of 28233128 in words is "twenty-eight million, two hundred thirty-three thousand, one hundred twenty-eight".