28749824 has 26 divisors (see below), whose sum is σ = 57500820. Its totient is φ = 14372864.

The previous prime is 28749811. The next prime is 28749827. The reversal of 28749824 is 42894782.

It is not an unprimeable number, because it can be changed into a prime (28749827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 587 + ... + 7605.

It is an arithmetic number, because the mean of its divisors is an integer number (2211570).

Almost surely, 2^28749824 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 28749824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28750410).

28749824 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28749824 is an frugal number, since it uses more digits than its factorization.

28749824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7043 (or 7021 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 28749824 is about 5361.8862352721. The cubic root of 28749824 is about 306.3456586361.

The spelling of 28749824 in words is "twenty-eight million, seven hundred forty-nine thousand, eight hundred twenty-four".