28239276 has 48 divisors (see below), whose sum is σ = 71474144. Its totient is φ = 8626176.

The previous prime is 28239271. The next prime is 28239287. The reversal of 28239276 is 67293282.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (28239271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23916 + ... + 25068.

Almost surely, 2^28239276 is an apocalyptic number.

28239276 is a gapful number since it is divisible by the number (26) 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 28239276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35737072).

28239276 is an abundant number, since it is smaller than the sum of its proper divisors (43234868).

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

28239276 is a wasteful number, since it uses less digits than its factorization.

28239276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330 (or 1328 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 28239276 is about 5314.0639815493. The cubic root of 28239276 is about 304.5214245025.

The spelling of 28239276 in words is "twenty-eight million, two hundred thirty-nine thousand, two hundred seventy-six".