28333280 has 48 divisors (see below), whose sum is σ = 68058144. Its totient is φ = 11143680.

The previous prime is 28333273. The next prime is 28333289. The reversal of 28333280 is 8233382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28333289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8309 + ... + 11211.

It is an arithmetic number, because the mean of its divisors is an integer number (1417878).

Almost surely, 2^28333280 is an apocalyptic number.

28333280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28333280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34029072).

28333280 is an abundant number, since it is smaller than the sum of its proper divisors (39724864).

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

28333280 is a wasteful number, since it uses less digits than its factorization.

28333280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2979 (or 2971 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 28333280 is about 5322.9014644271. The cubic root of 28333280 is about 304.8589511747.

The spelling of 28333280 in words is "twenty-eight million, three hundred thirty-three thousand, two hundred eighty".