28313280 has 224 divisors, whose sum is σ = 104241600. Its totient is φ = 7225344.

The previous prime is 28313273. The next prime is 28313291. The reversal of 28313280 is 8231382.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 250504 + ... + 250616.

Almost surely, 2^28313280 is an apocalyptic number.

28313280 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 28313280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52120800).

28313280 is an abundant number, since it is smaller than the sum of its proper divisors (75928320).

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

28313280 is a wasteful number, since it uses less digits than its factorization.

28313280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28313280 is about 5321.0224581372. The cubic root of 28313280 is about 304.7872026371.

The spelling of 28313280 in words is "twenty-eight million, three hundred thirteen thousand, two hundred eighty".