28731369 has 8 divisors (see below), whose sum is σ = 38688192. Its totient is φ = 18964400.

The previous prime is 28731361. The next prime is 28731371. The reversal of 28731369 is 96313782.

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 28731369 - 2³ = 28731361 is a prime.

It is a super-2 number, since 2×28731369² = 1650983129228322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28731361) 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, 47109 + ... + 47714.

It is an arithmetic number, because the mean of its divisors is an integer number (4836024).

Almost surely, 2^28731369 is an apocalyptic number.

It is an amenable number.

28731369 is a deficient number, since it is larger than the sum of its proper divisors (9956823).

28731369 is a wasteful number, since it uses less digits than its factorization.

28731369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94927.

The product of its digits is 54432, while the sum is 39.

The square root of 28731369 is about 5360.1650161166. The cubic root of 28731369 is about 306.2800951127.

The spelling of 28731369 in words is "twenty-eight million, seven hundred thirty-one thousand, three hundred sixty-nine".