28231379 has 4 divisors (see below), whose sum is σ = 30797880. Its totient is φ = 25664880.

The previous prime is 28231289. The next prime is 28231387. The reversal of 28231379 is 97313282.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28231379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28231079) 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, 1283234 + ... + 1283255.

It is an arithmetic number, because the mean of its divisors is an integer number (7699470).

Almost surely, 2^28231379 is an apocalyptic number.

28231379 is a deficient number, since it is larger than the sum of its proper divisors (2566501).

28231379 is a wasteful number, since it uses less digits than its factorization.

28231379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566500.

The product of its digits is 18144, while the sum is 35.

The square root of 28231379 is about 5313.3209012820. The cubic root of 28231379 is about 304.4930357921.

The spelling of 28231379 in words is "twenty-eight million, two hundred thirty-one thousand, three hundred seventy-nine".