28868369 has 4 divisors (see below), whose sum is σ = 29863860. Its totient is φ = 27872880.

The previous prime is 28868341. The next prime is 28868377. The reversal of 28868369 is 96386882.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4494400 + 24373969 = 2120^2 + 4937^2 .

It is a cyclic number.

It is not a de Polignac number, because 28868369 - 2¹⁶ = 28802833 is a prime.

It is a super-2 number, since 2×28868369² = 1666765457440322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28868269) 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, 497702 + ... + 497759.

It is an arithmetic number, because the mean of its divisors is an integer number (7465965).

Almost surely, 2^28868369 is an apocalyptic number.

28868369 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28868369 is a deficient number, since it is larger than the sum of its proper divisors (995491).

28868369 is an equidigital number, since it uses as much as digits as its factorization.

28868369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995490.

The product of its digits is 995328, while the sum is 50.

The square root of 28868369 is about 5372.9292755442. The cubic root of 28868369 is about 306.7661359487.

The spelling of 28868369 in words is "twenty-eight million, eight hundred sixty-eight thousand, three hundred sixty-nine".