28433280 has 128 divisors (see below), whose sum is σ = 92534400. Its totient is φ = 7424000.

The previous prime is 28433269. The next prime is 28433287. The reversal of 28433280 is 8233482.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28433287) 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, 113155 + ... + 113405.

It is an arithmetic number, because the mean of its divisors is an integer number (722925).

Almost surely, 2^28433280 is an apocalyptic number.

28433280 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 28433280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46267200).

28433280 is an abundant number, since it is smaller than the sum of its proper divisors (64101120).

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

28433280 is a wasteful number, since it uses less digits than its factorization.

28433280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 28433280 is about 5332.2865639423. The cubic root of 28433280 is about 305.2171883132.

The spelling of 28433280 in words is "twenty-eight million, four hundred thirty-three thousand, two hundred eighty".