28231236 has 54 divisors (see below), whose sum is σ = 78451646. Its totient is φ = 8553600.

The previous prime is 28231219. The next prime is 28231243. The reversal of 28231236 is 63213282.

It can be written as a sum of positive squares in only one way, i.e., 27878400 + 352836 = 5280^2 + 594^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1116 + ... + 7596.

Almost surely, 2^28231236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28231236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39225823).

28231236 is an abundant number, since it is smaller than the sum of its proper divisors (50220410).

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

28231236 is a wasteful number, since it uses less digits than its factorization.

28231236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6513 (or 6497 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 28231236 is about 5313.3074445208. The cubic root of 28231236 is about 304.4925216765.

The spelling of 28231236 in words is "twenty-eight million, two hundred thirty-one thousand, two hundred thirty-six".