28390272 has 64 divisors (see below), whose sum is σ = 79866000. Its totient is φ = 8904704.

The previous prime is 28390267. The next prime is 28390283. The reversal of 28390272 is 27209382.

It is a tau number, because it is divible by the number of its divisors (64).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 4354 + ... + 8702.

Almost surely, 2^28390272 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 28390272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39933000).

28390272 is an abundant number, since it is smaller than the sum of its proper divisors (51475728).

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

28390272 is a wasteful number, since it uses less digits than its factorization.

28390272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4383 (or 4371 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 28390272 is about 5328.2522462811. The cubic root of 28390272 is about 305.0632207923.

The spelling of 28390272 in words is "twenty-eight million, three hundred ninety thousand, two hundred seventy-two".