28881367 has 4 divisors (see below), whose sum is σ = 29813056. Its totient is φ = 27949680.

The previous prime is 28881323. The next prime is 28881379. The reversal of 28881367 is 76318882.

It is a happy number.

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 28881367 - 2⁷ = 28881239 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 (28881397) 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, 465798 + ... + 465859.

It is an arithmetic number, because the mean of its divisors is an integer number (7453264).

Almost surely, 2^28881367 is an apocalyptic number.

28881367 is a deficient number, since it is larger than the sum of its proper divisors (931689).

28881367 is an equidigital number, since it uses as much as digits as its factorization.

28881367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931688.

The product of its digits is 129024, while the sum is 43.

The square root of 28881367 is about 5374.1387216930. The cubic root of 28881367 is about 306.8121695845.

The spelling of 28881367 in words is "twenty-eight million, eight hundred eighty-one thousand, three hundred sixty-seven".