28318280 has 16 divisors (see below), whose sum is σ = 63716220. Its totient is φ = 11327296.

The previous prime is 28318253. The next prime is 28318291. The reversal of 28318280 is 8281382.

It can be written as a sum of positive squares in 2 ways, for example, as 25989604 + 2328676 = 5098^2 + 1526^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353939 + ... + 354018.

Almost surely, 2^28318280 is an apocalyptic number.

28318280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28318280 is an abundant number, since it is smaller than the sum of its proper divisors (35397940).

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

28318280 is a wasteful number, since it uses less digits than its factorization.

28318280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707968 (or 707964 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 28318280 is about 5321.4922719102. The cubic root of 28318280 is about 304.8051429383.

It can be divided in two parts, 2831 and 8280, that added together give a palindrome (11111).

The spelling of 28318280 in words is "twenty-eight million, three hundred eighteen thousand, two hundred eighty".