28164279638 has 8 divisors (see below), whose sum is σ = 46087003080. Its totient is φ = 12801945280.

The previous prime is 28164279629. The next prime is 28164279643. The reversal of 28164279638 is 83697246182.

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

It is a super-2 number, since 2×28164279638² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640097243 + ... + 640097286.

It is an arithmetic number, because the mean of its divisors is an integer number (5760875385).

Almost surely, 2^28164279638 is an apocalyptic number.

28164279638 is a deficient number, since it is larger than the sum of its proper divisors (17922723442).

28164279638 is a wasteful number, since it uses less digits than its factorization.

28164279638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280194542.

The product of its digits is 6967296, while the sum is 56.

The spelling of 28164279638 in words is "twenty-eight billion, one hundred sixty-four million, two hundred seventy-nine thousand, six hundred thirty-eight".