28667749 has 8 divisors (see below), whose sum is σ = 31485600. Its totient is φ = 25885200.

The previous prime is 28667719. The next prime is 28667801. The reversal of 28667749 is 94776682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28667749 - 2¹¹ = 28665701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28667719) 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, 7107 + ... + 10384.

It is an arithmetic number, because the mean of its divisors is an integer number (3935700).

Almost surely, 2^28667749 is an apocalyptic number.

It is an amenable number.

28667749 is a deficient number, since it is larger than the sum of its proper divisors (2817851).

28667749 is a wasteful number, since it uses less digits than its factorization.

28667749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17651.

The product of its digits is 1016064, while the sum is 49.

The square root of 28667749 is about 5354.2272084774. The cubic root of 28667749 is about 306.0538622488.

The spelling of 28667749 in words is "twenty-eight million, six hundred sixty-seven thousand, seven hundred forty-nine".