28081272 has 32 divisors (see below), whose sum is σ = 70375680. Its totient is φ = 9337440.

The previous prime is 28081253. The next prime is 28081337. The reversal of 28081272 is 27218082.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10593 + ... + 12975.

It is an arithmetic number, because the mean of its divisors is an integer number (2199240).

Almost surely, 2^28081272 is an apocalyptic number.

It is an amenable number.

28081272 is an abundant number, since it is smaller than the sum of its proper divisors (42294408).

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

28081272 is a wasteful number, since it uses less digits than its factorization.

28081272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2883 (or 2879 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 28081272 is about 5299.1765398031. The cubic root of 28081272 is about 303.9524106023.

The spelling of 28081272 in words is "twenty-eight million, eighty-one thousand, two hundred seventy-two".