28269331 has 4 divisors (see below), whose sum is σ = 28291464. Its totient is φ = 28247200.

The previous prime is 28269313. The next prime is 28269379. The reversal of 28269331 is 13396282.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28269331 - 2⁷ = 28269203 is a prime.

It is a super-2 number, since 2×28269331² = 1598310150375122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28267331) 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, 9025 + ... + 11746.

It is an arithmetic number, because the mean of its divisors is an integer number (7072866).

Almost surely, 2^28269331 is an apocalyptic number.

28269331 is a deficient number, since it is larger than the sum of its proper divisors (22133).

28269331 is a wasteful number, since it uses less digits than its factorization.

28269331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22132.

The product of its digits is 15552, while the sum is 34.

The square root of 28269331 is about 5316.8911028909. The cubic root of 28269331 is about 304.6294200283.

The spelling of 28269331 in words is "twenty-eight million, two hundred sixty-nine thousand, three hundred thirty-one".