27984792138 has 32 divisors (see below), whose sum is σ = 57474717696. Its totient is φ = 9080180928.

The previous prime is 27984792137. The next prime is 27984792169. The reversal of 27984792138 is 83129748972.

It is a super-2 number, since 2×27984792138² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27984792137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306081 + ... + 386852.

It is an arithmetic number, because the mean of its divisors is an integer number (1796084928).

Almost surely, 2^27984792138 is an apocalyptic number.

27984792138 is an abundant number, since it is smaller than the sum of its proper divisors (29489925558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27984792138 is a wasteful number, since it uses less digits than its factorization.

27984792138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693118.

The product of its digits is 12192768, while the sum is 60.

The spelling of 27984792138 in words is "twenty-seven billion, nine hundred eighty-four million, seven hundred ninety-two thousand, one hundred thirty-eight".