28051399 has 8 divisors (see below), whose sum is σ = 28877120. Its totient is φ = 27237600.

The previous prime is 28051369. The next prime is 28051403. The reversal of 28051399 is 99315082.

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 28051399 - 2¹³ = 28043207 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 (28051369) 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 7 ways as a sum of consecutive naturals, for example, 1909 + ... + 7729.

It is an arithmetic number, because the mean of its divisors is an integer number (3609640).

Almost surely, 2^28051399 is an apocalyptic number.

28051399 is a deficient number, since it is larger than the sum of its proper divisors (825721).

28051399 is an equidigital number, since it uses as much as digits as its factorization.

28051399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5961.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 28051399 is about 5296.3571443021. The cubic root of 28051399 is about 303.8445903198.

The spelling of 28051399 in words is "twenty-eight million, fifty-one thousand, three hundred ninety-nine".