28786747 has 12 divisors (see below), whose sum is σ = 32084920. Its totient is φ = 25803360.

The previous prime is 28786741. The next prime is 28786757. The reversal of 28786747 is 74768782.

It is a happy number.

It is not a de Polignac number, because 28786747 - 2²³ = 20398139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28786747.

It is not an unprimeable number, because it can be changed into a prime (28786741) 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 11 ways as a sum of consecutive naturals, for example, 7204 + ... + 10462.

Almost surely, 2^28786747 is an apocalyptic number.

28786747 is a deficient number, since it is larger than the sum of its proper divisors (3298173).

28786747 is a wasteful number, since it uses less digits than its factorization.

28786747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3354 (or 3343 counting only the distinct ones).

The product of its digits is 1053696, while the sum is 49.

The square root of 28786747 is about 5365.3282285430. The cubic root of 28786747 is about 306.4767476929.

The spelling of 28786747 in words is "twenty-eight million, seven hundred eighty-six thousand, seven hundred forty-seven".