28920272 has 40 divisors (see below), whose sum is σ = 58329600. Its totient is φ = 13875840.

The previous prime is 28920263. The next prime is 28920277. The reversal of 28920272 is 27202982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28920277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98558 + ... + 98850.

It is an arithmetic number, because the mean of its divisors is an integer number (1458240).

Almost surely, 2^28920272 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 28920272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29164800).

28920272 is an abundant number, since it is smaller than the sum of its proper divisors (29409328).

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

28920272 is a wasteful number, since it uses less digits than its factorization.

28920272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531 (or 525 counting only the distinct ones).

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

The square root of 28920272 is about 5377.7571533122. The cubic root of 28920272 is about 306.9498728046.

It can be divided in two parts, 28920 and 272, that added together give a palindrome (29192).

The spelling of 28920272 in words is "twenty-eight million, nine hundred twenty thousand, two hundred seventy-two".