28167639 has 8 divisors (see below), whose sum is σ = 37585392. Its totient is φ = 18764160.

The previous prime is 28167631. The next prime is 28167641. The reversal of 28167639 is 93676182.

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 28167639 - 2³ = 28167631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28167639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28167631) 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 7 ways as a sum of consecutive naturals, for example, 2527 + ... + 7919.

It is an arithmetic number, because the mean of its divisors is an integer number (4698174).

Almost surely, 2^28167639 is an apocalyptic number.

28167639 is a deficient number, since it is larger than the sum of its proper divisors (9417753).

28167639 is a wasteful number, since it uses less digits than its factorization.

28167639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7137.

The product of its digits is 108864, while the sum is 42.

The square root of 28167639 is about 5307.3193798753. The cubic root of 28167639 is about 304.2637045573.

The spelling of 28167639 in words is "twenty-eight million, one hundred sixty-seven thousand, six hundred thirty-nine".