28749648 has 60 divisors (see below), whose sum is σ = 77221248. Its totient is φ = 9207360.

The previous prime is 28749619. The next prime is 28749649. The reversal of 28749648 is 84694782.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 28749597 and 28749606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28749649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 206763 + ... + 206901.

Almost surely, 2^28749648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28749648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38610624).

28749648 is an abundant number, since it is smaller than the sum of its proper divisors (48471600).

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

28749648 is a wasteful number, since it uses less digits than its factorization.

28749648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 175 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The square root of 28749648 is about 5361.8698231121. The cubic root of 28749648 is about 306.3450335083.

The spelling of 28749648 in words is "twenty-eight million, seven hundred forty-nine thousand, six hundred forty-eight".