28749744 has 60 divisors (see below), whose sum is σ = 81999216. Its totient is φ = 9399936.

The previous prime is 28749719. The next prime is 28749811. The reversal of 28749744 is 44794782.

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 self number, because there is not a number n which added to its sum of digits gives 28749744.

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, 5749 + ... + 9515.

Almost surely, 2^28749744 is an apocalyptic number.

28749744 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 28749744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40999608).

28749744 is an abundant number, since it is smaller than the sum of its proper divisors (53249472).

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

28749744 is a wasteful number, since it uses less digits than its factorization.

28749744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3834 (or 3825 counting only the distinct ones).

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

The square root of 28749744 is about 5361.8787752056. The cubic root of 28749744 is about 306.3453744874.

The spelling of 28749744 in words is "twenty-eight million, seven hundred forty-nine thousand, seven hundred forty-four".