28529280 has 256 divisors, whose sum is σ = 109670400. Its totient is φ = 6967296.

The previous prime is 28529261. The next prime is 28529309. The reversal of 28529280 is 8292582.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 224577 + ... + 224703.

It is an arithmetic number, because the mean of its divisors is an integer number (428400).

Almost surely, 2^28529280 is an apocalyptic number.

28529280 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 28529280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54835200).

28529280 is an abundant number, since it is smaller than the sum of its proper divisors (81141120).

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

28529280 is a wasteful number, since it uses less digits than its factorization.

28529280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28529280 is about 5341.2807452895. The cubic root of 28529280 is about 305.5603066050.

The spelling of 28529280 in words is "twenty-eight million, five hundred twenty-nine thousand, two hundred eighty".