28279869 has 8 divisors (see below), whose sum is σ = 37775040. Its totient is φ = 18818976.

The previous prime is 28279861. The next prime is 28279871. The reversal of 28279869 is 96897282.

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 28279869 - 2³ = 28279861 is a prime.

It is a super-2 number, since 2×28279869² = 1599501981314322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28279861) 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, 6577 + ... + 9990.

It is an arithmetic number, because the mean of its divisors is an integer number (4721880).

Almost surely, 2^28279869 is an apocalyptic number.

It is an amenable number.

28279869 is a deficient number, since it is larger than the sum of its proper divisors (9495171).

28279869 is a wasteful number, since it uses less digits than its factorization.

28279869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17139.

The product of its digits is 870912, while the sum is 51.

The square root of 28279869 is about 5317.8820032039. The cubic root of 28279869 is about 304.6672677111.

The spelling of 28279869 in words is "twenty-eight million, two hundred seventy-nine thousand, eight hundred sixty-nine".