28149744 has 80 divisors (see below), whose sum is σ = 83724800. Its totient is φ = 7983360.

The previous prime is 28149743. The next prime is 28149761. The reversal of 28149744 is 44794182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28149743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66654 + ... + 67074.

It is an arithmetic number, because the mean of its divisors is an integer number (1046560).

Almost surely, 2^28149744 is an apocalyptic number.

28149744 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 28149744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41862400).

28149744 is an abundant number, since it is smaller than the sum of its proper divisors (55575056).

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

28149744 is a wasteful number, since it uses less digits than its factorization.

28149744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638 (or 632 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 28149744 is about 5305.6332327065. The cubic root of 28149744 is about 304.1992576408.

The spelling of 28149744 in words is "twenty-eight million, one hundred forty-nine thousand, seven hundred forty-four".