28764399 has 8 divisors (see below), whose sum is σ = 38396592. Its totient is φ = 19154240.

The previous prime is 28764389. The next prime is 28764401. The reversal of 28764399 is 99346782.

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 28764399 - 2¹⁵ = 28731631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28764389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2172 + ... + 7889.

It is an arithmetic number, because the mean of its divisors is an integer number (4799574).

Almost surely, 2^28764399 is an apocalyptic number.

28764399 is a deficient number, since it is larger than the sum of its proper divisors (9632193).

28764399 is a wasteful number, since it uses less digits than its factorization.

28764399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11017.

The product of its digits is 653184, while the sum is 48.

The square root of 28764399 is about 5363.2451929778. The cubic root of 28764399 is about 306.3974181839.

The spelling of 28764399 in words is "twenty-eight million, seven hundred sixty-four thousand, three hundred ninety-nine".