28146269 has 4 divisors (see below), whose sum is σ = 29116860. Its totient is φ = 27175680.

The previous prime is 28146263. The next prime is 28146281. The reversal of 28146269 is 96264182.

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 5583769 + 22562500 = 2363^2 + 4750^2 .

It is a cyclic number.

It is not a de Polignac number, because 28146269 - 2⁴ = 28146253 is a prime.

It is a super-2 number, since 2×28146269² = 1584424917240722, which 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 (28146263) 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, 485252 + ... + 485309.

It is an arithmetic number, because the mean of its divisors is an integer number (7279215).

Almost surely, 2^28146269 is an apocalyptic number.

28146269 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28146269 is a deficient number, since it is larger than the sum of its proper divisors (970591).

28146269 is an equidigital number, since it uses as much as digits as its factorization.

28146269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970590.

The product of its digits is 41472, while the sum is 38.

The square root of 28146269 is about 5305.3057404828. The cubic root of 28146269 is about 304.1867396357.

The spelling of 28146269 in words is "twenty-eight million, one hundred forty-six thousand, two hundred sixty-nine".