28733472 has 144 divisors (see below), whose sum is σ = 88452000. Its totient is φ = 8819712.

The previous prime is 28733443. The next prime is 28733479. The reversal of 28733472 is 27433782.

28733472 is nontrivially palindromic in base 5.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×28733472² = 1651224826349568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28733479) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 322804 + ... + 322892.

It is an arithmetic number, because the mean of its divisors is an integer number (614250).

Almost surely, 2^28733472 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 28733472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44226000).

28733472 is an abundant number, since it is smaller than the sum of its proper divisors (59718528).

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

28733472 is a wasteful number, since it uses less digits than its factorization.

28733472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 172 counting only the distinct ones).

The product of its digits is 56448, while the sum is 36.

The square root of 28733472 is about 5360.3611818608. The cubic root of 28733472 is about 306.2875676807.

The spelling of 28733472 in words is "twenty-eight million, seven hundred thirty-three thousand, four hundred seventy-two".