28921367 has 4 divisors (see below), whose sum is σ = 28957416. Its totient is φ = 28885320.

The previous prime is 28921349. The next prime is 28921397. The reversal of 28921367 is 76312982.

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 28921367 - 2⁶ = 28921303 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 28921367.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28921307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16793 + ... + 18434.

It is an arithmetic number, because the mean of its divisors is an integer number (7239354).

Almost surely, 2^28921367 is an apocalyptic number.

28921367 is a deficient number, since it is larger than the sum of its proper divisors (36049).

28921367 is an equidigital number, since it uses as much as digits as its factorization.

28921367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36048.

The product of its digits is 36288, while the sum is 38.

The square root of 28921367 is about 5377.8589605902. The cubic root of 28921367 is about 306.9537467409.

The spelling of 28921367 in words is "twenty-eight million, nine hundred twenty-one thousand, three hundred sixty-seven".