28840379 has 4 divisors (see below), whose sum is σ = 28853184. Its totient is φ = 28827576.

The previous prime is 28840363. The next prime is 28840387. The reversal of 28840379 is 97304882.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28840379 - 2⁴ = 28840363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28840319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2027 + ... + 7860.

It is an arithmetic number, because the mean of its divisors is an integer number (7213296).

Almost surely, 2^28840379 is an apocalyptic number.

28840379 is a deficient number, since it is larger than the sum of its proper divisors (12805).

28840379 is an equidigital number, since it uses as much as digits as its factorization.

28840379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12804.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 28840379 is about 5370.3239194671. The cubic root of 28840379 is about 306.6669598033. Note that the first 3 decimals are identical.

The spelling of 28840379 in words is "twenty-eight million, eight hundred forty thousand, three hundred seventy-nine".