28667607 has 4 divisors (see below), whose sum is σ = 38223480. Its totient is φ = 19111736.

The previous prime is 28667581. The next prime is 28667609. The reversal of 28667607 is 70676682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28667607 - 2⁶ = 28667543 is a prime.

It is a super-2 number, since 2×28667607² = 1643663382212898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28667609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4777932 + ... + 4777937.

It is an arithmetic number, because the mean of its divisors is an integer number (9555870).

Almost surely, 2^28667607 is an apocalyptic number.

28667607 is a deficient number, since it is larger than the sum of its proper divisors (9555873).

28667607 is an equidigital number, since it uses as much as digits as its factorization.

28667607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9555872.

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 28667607 is about 5354.2139479106. The cubic root of 28667607 is about 306.0533569223.

The spelling of 28667607 in words is "twenty-eight million, six hundred sixty-seven thousand, six hundred seven".