28749448 has 128 divisors (see below), whose sum is σ = 74027520. Its totient is φ = 10137600.

The previous prime is 28749421. The next prime is 28749449. The reversal of 28749448 is 84494782.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a junction number, because it is equal to n+sod(n) for n = 28749398 and 28749407.

It is not an unprimeable number, because it can be changed into a prime (28749449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 284598 + ... + 284698.

It is an arithmetic number, because the mean of its divisors is an integer number (578340).

Almost surely, 2^28749448 is an apocalyptic number.

28749448 is a gapful number since it is divisible by the number (28) 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 28749448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37013760).

28749448 is an abundant number, since it is smaller than the sum of its proper divisors (45278072).

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

28749448 is a wasteful number, since it uses less digits than its factorization.

28749448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 163 counting only the distinct ones).

The product of its digits is 516096, while the sum is 46.

The square root of 28749448 is about 5361.8511728693. The cubic root of 28749448 is about 306.3443231327.

The spelling of 28749448 in words is "twenty-eight million, seven hundred forty-nine thousand, four hundred forty-eight".