28673869 has 18 divisors (see below), whose sum is σ = 35224974. Its totient is φ = 23269680.

The previous prime is 28673857. The next prime is 28673891. The reversal of 28673869 is 96837682.

It can be written as a sum of positive squares in only one way, i.e., 26904969 + 1768900 = 5187^2 + 1330^2 .

It is not a de Polignac number, because 28673869 - 2¹¹ = 28671821 is a prime.

It is a super-2 number, since 2×28673869² = 1644381526858322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28673809) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16879 + ... + 18499.

It is an arithmetic number, because the mean of its divisors is an integer number (1956943).

Almost surely, 2^28673869 is an apocalyptic number.

It is an amenable number.

28673869 is a deficient number, since it is larger than the sum of its proper divisors (6551105).

28673869 is a wasteful number, since it uses less digits than its factorization.

28673869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673 (or 1647 counting only the distinct ones).

The product of its digits is 870912, while the sum is 49.

The square root of 28673869 is about 5354.7986890265. The cubic root of 28673869 is about 306.0756395239.

The spelling of 28673869 in words is "twenty-eight million, six hundred seventy-three thousand, eight hundred sixty-nine".