28346399 has 4 divisors (see below), whose sum is σ = 28369680. Its totient is φ = 28323120.

The previous prime is 28346393. The next prime is 28346401. The reversal of 28346399 is 99364382.

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-28346399 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 (28346393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9707 + ... + 12284.

It is an arithmetic number, because the mean of its divisors is an integer number (7092420).

Almost surely, 2^28346399 is an apocalyptic number.

28346399 is a deficient number, since it is larger than the sum of its proper divisors (23281).

28346399 is a wasteful number, since it uses less digits than its factorization.

28346399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23280.

The product of its digits is 279936, while the sum is 44.

The square root of 28346399 is about 5324.1336384430. The cubic root of 28346399 is about 304.9059962922.

The spelling of 28346399 in words is "twenty-eight million, three hundred forty-six thousand, three hundred ninety-nine".