28947744 has 144 divisors (see below), whose sum is σ = 95764032. Its totient is φ = 8123904.

The previous prime is 28947739. The next prime is 28947791. The reversal of 28947744 is 44774982.

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

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 28947744.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167242 + ... + 167414.

It is an arithmetic number, because the mean of its divisors is an integer number (665028).

Almost surely, 2^28947744 is an apocalyptic number.

28947744 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 28947744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47882016).

28947744 is an abundant number, since it is smaller than the sum of its proper divisors (66816288).

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

28947744 is a wasteful number, since it uses less digits than its factorization.

28947744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 268 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 28947744 is about 5380.3107716934. The cubic root of 28947744 is about 307.0470348488.

The spelling of 28947744 in words is "twenty-eight million, nine hundred forty-seven thousand, seven hundred forty-four".