28945280 has 192 divisors, whose sum is σ = 87907680. Its totient is φ = 9031680.

The previous prime is 28945253. The next prime is 28945283. The reversal of 28945280 is 8254982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28945283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 407645 + ... + 407715.

Almost surely, 2^28945280 is an apocalyptic number.

28945280 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 28945280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43953840).

28945280 is an abundant number, since it is smaller than the sum of its proper divisors (58962400).

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

28945280 is a wasteful number, since it uses less digits than its factorization.

28945280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 28945280 is about 5380.0817837650. The cubic root of 28945280 is about 307.0383227668.

The spelling of 28945280 in words is "twenty-eight million, nine hundred forty-five thousand, two hundred eighty".