28761767 has 4 divisors (see below), whose sum is σ = 29125920. Its totient is φ = 28397616.

The previous prime is 28761751. The next prime is 28761779. The reversal of 28761767 is 76716782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76716782 = 2 ⋅38358391.

It is a cyclic number.

It is not a de Polignac number, because 28761767 - 2⁴ = 28761751 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 (28761737) 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, 181958 + ... + 182115.

It is an arithmetic number, because the mean of its divisors is an integer number (7281480).

Almost surely, 2^28761767 is an apocalyptic number.

28761767 is a deficient number, since it is larger than the sum of its proper divisors (364153).

28761767 is an equidigital number, since it uses as much as digits as its factorization.

28761767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364152.

The product of its digits is 197568, while the sum is 44.

The square root of 28761767 is about 5362.9998135372. Note that the first 3 decimals coincide. The cubic root of 28761767 is about 306.3880725734.

The spelling of 28761767 in words is "twenty-eight million, seven hundred sixty-one thousand, seven hundred sixty-seven".