28144699 has 4 divisors (see below), whose sum is σ = 30703320. Its totient is φ = 25586080.

The previous prime is 28144691. The next prime is 28144723. The reversal of 28144699 is 99644182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28144699 - 2³ = 28144691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28144691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1279294 + ... + 1279315.

It is an arithmetic number, because the mean of its divisors is an integer number (7675830).

Almost surely, 2^28144699 is an apocalyptic number.

28144699 is a deficient number, since it is larger than the sum of its proper divisors (2558621).

28144699 is a wasteful number, since it uses less digits than its factorization.

28144699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2558620.

The product of its digits is 124416, while the sum is 43.

The square root of 28144699 is about 5305.1577733372. The cubic root of 28144699 is about 304.1810836810.

The spelling of 28144699 in words is "twenty-eight million, one hundred forty-four thousand, six hundred ninety-nine".