28261369 has 4 divisors (see below), whose sum is σ = 28272244. Its totient is φ = 28250496.

The previous prime is 28261307. The next prime is 28261391. The reversal of 28261369 is 96316282.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 23474025 + 4787344 = 4845^2 + 2188^2 .

It is a cyclic number.

It is not a de Polignac number, because 28261369 - 2²³ = 19872761 is a prime.

It is a super-2 number, since 2×28261369² = 1597409955508322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28261169) 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, 1009 + ... + 7585.

It is an arithmetic number, because the mean of its divisors is an integer number (7068061).

Almost surely, 2^28261369 is an apocalyptic number.

It is an amenable number.

28261369 is a deficient number, since it is larger than the sum of its proper divisors (10875).

28261369 is an equidigital number, since it uses as much as digits as its factorization.

28261369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10874.

The product of its digits is 31104, while the sum is 37.

The square root of 28261369 is about 5316.1423043406. The cubic root of 28261369 is about 304.6008179225.

The spelling of 28261369 in words is "twenty-eight million, two hundred sixty-one thousand, three hundred sixty-nine".