28987748 has 12 divisors (see below), whose sum is σ = 50890812. Its totient is φ = 14447520.

The previous prime is 28987747. The next prime is 28987769. The reversal of 28987748 is 84778982.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14303524 + 14684224 = 3782^2 + 3832^2 .

It is a super-2 number, since 2×28987748² = 1680579068223008, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28987748.

It is not an unprimeable number, because it can be changed into a prime (28987747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10163 + ... + 12698.

It is an arithmetic number, because the mean of its divisors is an integer number (4240901).

Almost surely, 2^28987748 is an apocalyptic number.

It is an amenable number.

28987748 is a deficient number, since it is larger than the sum of its proper divisors (21903064).

28987748 is a wasteful number, since it uses less digits than its factorization.

28987748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23182 (or 23180 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 53.

The square root of 28987748 is about 5384.0271173166. The cubic root of 28987748 is about 307.1884097777.

The spelling of 28987748 in words is "twenty-eight million, nine hundred eighty-seven thousand, seven hundred forty-eight".