28396280 has 48 divisors (see below), whose sum is σ = 70239960. Its totient is φ = 10324160.

The previous prime is 28396267. The next prime is 28396289. The reversal of 28396280 is 8269382.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28396289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1907 + ... + 7773.

Almost surely, 2^28396280 is an apocalyptic number.

28396280 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 28396280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35119980).

28396280 is an abundant number, since it is smaller than the sum of its proper divisors (41843680).

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

28396280 is a wasteful number, since it uses less digits than its factorization.

28396280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5900 (or 5885 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 28396280 is about 5328.8160035790. The cubic root of 28396280 is about 305.0847386155.

It can be divided in two parts, 2839 and 6280, that added together give a palindrome (9119).

The spelling of 28396280 in words is "twenty-eight million, three hundred ninety-six thousand, two hundred eighty".