28209272 has 32 divisors (see below), whose sum is σ = 65100000. Its totient is φ = 11159424.

The previous prime is 28209263. The next prime is 28209283. The reversal of 28209272 is 27290282.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18647 + ... + 20102.

It is an arithmetic number, because the mean of its divisors is an integer number (2034375).

Almost surely, 2^28209272 is an apocalyptic number.

It is an amenable number.

28209272 is an abundant number, since it is smaller than the sum of its proper divisors (36890728).

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

28209272 is a wasteful number, since it uses less digits than its factorization.

28209272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38775 (or 38771 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 28209272 is about 5311.2401564983. The cubic root of 28209272 is about 304.4135357748.

The spelling of 28209272 in words is "twenty-eight million, two hundred nine thousand, two hundred seventy-two".