28169280 has 84 divisors (see below), whose sum is σ = 96900492. Its totient is φ = 7511040.

The previous prime is 28169269. The next prime is 28169299. The reversal of 28169280 is 8296182.

It can be written as a sum of positive squares in 2 ways, for example, as 11128896 + 17040384 = 3336^2 + 4128^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2011 + ... + 7770.

Almost surely, 2^28169280 is an apocalyptic number.

28169280 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 28169280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48450246).

28169280 is an abundant number, since it is smaller than the sum of its proper divisors (68731212).

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

28169280 is a wasteful number, since it uses less digits than its factorization.

28169280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9804 (or 9791 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 28169280 is about 5307.4739754426. The cubic root of 28169280 is about 304.2696130757.

The spelling of 28169280 in words is "twenty-eight million, one hundred sixty-nine thousand, two hundred eighty".