28667701 has 4 divisors (see below), whose sum is σ = 28989900. Its totient is φ = 28345504.

The previous prime is 28667699. The next prime is 28667707. The reversal of 28667701 is 10776682.

It is a happy number.

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 10400625 + 18267076 = 3225^2 + 4274^2 .

It is a cyclic number.

It is not a de Polignac number, because 28667701 - 2¹ = 28667699 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 (28667707) 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, 160966 + ... + 161143.

It is an arithmetic number, because the mean of its divisors is an integer number (7247475).

Almost surely, 2^28667701 is an apocalyptic number.

It is an amenable number.

28667701 is a deficient number, since it is larger than the sum of its proper divisors (322199).

28667701 is an equidigital number, since it uses as much as digits as its factorization.

28667701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322198.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 28667701 is about 5354.2227260360. Note that the first 3 decimals coincide. The cubic root of 28667701 is about 306.0536914344.

The spelling of 28667701 in words is "twenty-eight million, six hundred sixty-seven thousand, seven hundred one".