28728583869 has 8 divisors (see below), whose sum is σ = 38427159232. Its totient is φ = 19091198880.

The previous prime is 28728583783. The next prime is 28728583879. The reversal of 28728583869 is 96838582782.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28728583869 - 2¹¹ = 28728581821 is a prime.

It is a super-2 number, since 2×28728583869² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28728583879) 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, 15296497 + ... + 15298374.

It is an arithmetic number, because the mean of its divisors is an integer number (4803394904).

Almost surely, 2^28728583869 is an apocalyptic number.

It is an amenable number.

28728583869 is a deficient number, since it is larger than the sum of its proper divisors (9698575363).

28728583869 is a wasteful number, since it uses less digits than its factorization.

28728583869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30595187.

The product of its digits is 92897280, while the sum is 66.

The spelling of 28728583869 in words is "twenty-eight billion, seven hundred twenty-eight million, five hundred eighty-three thousand, eight hundred sixty-nine".