27949821879 has 8 divisors (see below), whose sum is σ = 42590204800. Its totient is φ = 15971326776.

The previous prime is 27949821857. The next prime is 27949821899. The reversal of 27949821879 is 97812894972.

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

It is not a de Polignac number, because 27949821879 - 2⁷ = 27949821751 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 (27949821829) 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, 665471929 + ... + 665471970.

It is an arithmetic number, because the mean of its divisors is an integer number (5323775600).

Almost surely, 2^27949821879 is an apocalyptic number.

27949821879 is a deficient number, since it is larger than the sum of its proper divisors (14640382921).

27949821879 is a wasteful number, since it uses less digits than its factorization.

27949821879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330943909.

The product of its digits is 36578304, while the sum is 66.

The spelling of 27949821879 in words is "twenty-seven billion, nine hundred forty-nine million, eight hundred twenty-one thousand, eight hundred seventy-nine".