28433220 has 24 divisors (see below), whose sum is σ = 79613184. Its totient is φ = 7582176.

The previous prime is 28433203. The next prime is 28433239. The reversal of 28433220 is 2233482.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 236884 + ... + 237003.

It is an arithmetic number, because the mean of its divisors is an integer number (3317216).

Almost surely, 2^28433220 is an apocalyptic number.

28433220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28433220 is an abundant number, since it is smaller than the sum of its proper divisors (51179964).

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

28433220 is a wasteful number, since it uses less digits than its factorization.

28433220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473899 (or 473897 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 28433220 is about 5332.2809378351. The cubic root of 28433220 is about 305.2169736229.

The spelling of 28433220 in words is "twenty-eight million, four hundred thirty-three thousand, two hundred twenty".