28791472 has 40 divisors (see below), whose sum is σ = 59540832. Its totient is φ = 13440000.

The previous prime is 28791463. The next prime is 28791473. The reversal of 28791472 is 27419782.

It is not an unprimeable number, because it can be changed into a prime (28791473) by changing a digit.

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, 40722 + ... + 41422.

Almost surely, 2^28791472 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 28791472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29770416).

28791472 is an abundant number, since it is smaller than the sum of its proper divisors (30749360).

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

28791472 is a wasteful number, since it uses less digits than its factorization.

28791472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877 (or 871 counting only the distinct ones).

The product of its digits is 56448, while the sum is 40.

The square root of 28791472 is about 5365.7685376840. The cubic root of 28791472 is about 306.4935149390.

The spelling of 28791472 in words is "twenty-eight million, seven hundred ninety-one thousand, four hundred seventy-two".