28087749 has 16 divisors (see below), whose sum is σ = 41696640. Its totient is φ = 18686880.

The previous prime is 28087733. The next prime is 28087751. The reversal of 28087749 is 94778082.

It is not a de Polignac number, because 28087749 - 2⁴ = 28087733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28087789) 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 15 ways as a sum of consecutive naturals, for example, 19864 + ... + 21230.

It is an arithmetic number, because the mean of its divisors is an integer number (2606040).

Almost surely, 2^28087749 is an apocalyptic number.

It is an amenable number.

28087749 is a deficient number, since it is larger than the sum of its proper divisors (13608891).

28087749 is a wasteful number, since it uses less digits than its factorization.

28087749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137 (or 2131 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 28087749 is about 5299.7876372549. The cubic root of 28087749 is about 303.9757778773.

The spelling of 28087749 in words is "twenty-eight million, eighty-seven thousand, seven hundred forty-nine".