28321799 has 8 divisors (see below), whose sum is σ = 32522880. Its totient is φ = 24391800.

The previous prime is 28321781. The next prime is 28321801. The reversal of 28321799 is 99712382.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28321799 - 2¹² = 28317703 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 (28321729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67547 + ... + 67964.

It is an arithmetic number, because the mean of its divisors is an integer number (4065360).

Almost surely, 2^28321799 is an apocalyptic number.

28321799 is a deficient number, since it is larger than the sum of its proper divisors (4201081).

28321799 is a wasteful number, since it uses less digits than its factorization.

28321799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135541.

The product of its digits is 54432, while the sum is 41.

The square root of 28321799 is about 5321.8229019764. The cubic root of 28321799 is about 304.8177680562.

The spelling of 28321799 in words is "twenty-eight million, three hundred twenty-one thousand, seven hundred ninety-nine".