28748736 has 112 divisors (see below), whose sum is σ = 85831680. Its totient is φ = 9434880.

The previous prime is 28748719. The next prime is 28748743. The reversal of 28748736 is 63784782.

It is a happy number.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 28748691 and 28748700.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 219391 + ... + 219521.

Almost surely, 2^28748736 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 28748736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42915840).

28748736 is an abundant number, since it is smaller than the sum of its proper divisors (57082944).

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

28748736 is a wasteful number, since it uses less digits than its factorization.

28748736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279 (or 263 counting only the distinct ones).

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

The square root of 28748736 is about 5361.7847774785. The cubic root of 28748736 is about 306.3417941686.

The spelling of 28748736 in words is "twenty-eight million, seven hundred forty-eight thousand, seven hundred thirty-six".