28087744 has 28 divisors (see below), whose sum is σ = 55905400. Its totient is φ = 14001408.

The previous prime is 28087733. The next prime is 28087751. The reversal of 28087744 is 44778082.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28087697 and 28087706.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39262 + ... + 39970.

Almost surely, 2^28087744 is an apocalyptic number.

It is an amenable number.

28087744 is a deficient number, since it is larger than the sum of its proper divisors (27817656).

28087744 is an equidigital number, since it uses as much as digits as its factorization.

28087744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340 (or 1330 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 40.

The square root of 28087744 is about 5299.7871655379. The cubic root of 28087744 is about 303.9757598401.

The spelling of 28087744 in words is "twenty-eight million, eighty-seven thousand, seven hundred forty-four".