28729824 has 72 divisors (see below), whose sum is σ = 79689960. Its totient is φ = 9061632.

The previous prime is 28729819. The next prime is 28729853. The reversal of 28729824 is 42892782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34242 + ... + 35070.

It is an arithmetic number, because the mean of its divisors is an integer number (1106805).

Almost surely, 2^28729824 is an apocalyptic number.

28729824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28729824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39844980).

28729824 is an abundant number, since it is smaller than the sum of its proper divisors (50960136).

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

28729824 is a wasteful number, since it uses less digits than its factorization.

28729824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880 (or 853 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 28729824 is about 5360.0208954817. The cubic root of 28729824 is about 306.2746050480.

The spelling of 28729824 in words is "twenty-eight million, seven hundred twenty-nine thousand, eight hundred twenty-four".