28001369 has 8 divisors (see below), whose sum is σ = 30659040. Its totient is φ = 25362400.

The previous prime is 28001359. The next prime is 28001399. The reversal of 28001369 is 96310082.

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 28001369 - 2⁴ = 28001353 is a prime.

It is a super-2 number, since 2×28001369² = 1568153331748322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28001359) 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, 1439 + ... + 7620.

It is an arithmetic number, because the mean of its divisors is an integer number (3832380).

Almost surely, 2^28001369 is an apocalyptic number.

It is an amenable number.

28001369 is a deficient number, since it is larger than the sum of its proper divisors (2657671).

28001369 is a wasteful number, since it uses less digits than its factorization.

28001369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9351.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 28001369 is about 5291.6319788889. The cubic root of 28001369 is about 303.6638460239.

It can be divided in two parts, 280013 and 69, that added together give a palindrome (280082).

The spelling of 28001369 in words is "twenty-eight million, one thousand, three hundred sixty-nine".