28840272 has 80 divisors (see below), whose sum is σ = 77584320. Its totient is φ = 9225216.

The previous prime is 28840249. The next prime is 28840277. The reversal of 28840272 is 27204882.

It is a super-2 number, since 2×28840272² = 1663522578067968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28840277) 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, 183618 + ... + 183774.

It is an arithmetic number, because the mean of its divisors is an integer number (969804).

Almost surely, 2^28840272 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 28840272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38792160).

28840272 is an abundant number, since it is smaller than the sum of its proper divisors (48744048).

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

28840272 is a wasteful number, since it uses less digits than its factorization.

28840272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 28840272 is about 5370.3139573027. The cubic root of 28840272 is about 306.6665805503. Note that the first 3 decimals are identical.

The spelling of 28840272 in words is "twenty-eight million, eight hundred forty thousand, two hundred seventy-two".