28712767 has 4 divisors (see below), whose sum is σ = 28727200. Its totient is φ = 28698336.

The previous prime is 28712759. The next prime is 28712807. The reversal of 28712767 is 76721782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28712767 - 2³ = 28712759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28772767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3642 + ... + 8407.

It is an arithmetic number, because the mean of its divisors is an integer number (7181800).

Almost surely, 2^28712767 is an apocalyptic number.

28712767 is a deficient number, since it is larger than the sum of its proper divisors (14433).

28712767 is a wasteful number, since it uses less digits than its factorization.

28712767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14432.

The product of its digits is 65856, while the sum is 40.

The square root of 28712767 is about 5358.4295273895. The cubic root of 28712767 is about 306.2139809367.

The spelling of 28712767 in words is "twenty-eight million, seven hundred twelve thousand, seven hundred sixty-seven".