8139281378 has 8 divisors (see below), whose sum is σ = 12506700780. Its totient is φ = 3970381120.

The previous prime is 8139281363. The next prime is 8139281383. The reversal of 8139281378 is 8731829318.

It can be written as a sum of positive squares in 2 ways, for example, as 8114946889 + 24334489 = 90083^2 + 4933^2 .

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

It is an unprimeable number.

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, 49629683 + ... + 49629846.

Almost surely, 2^8139281378 is an apocalyptic number.

8139281378 is a deficient number, since it is larger than the sum of its proper divisors (4367419402).

8139281378 is a wasteful number, since it uses less digits than its factorization.

8139281378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99259572.

The product of its digits is 580608, while the sum is 50.

The square root of 8139281378 is about 90217.9659380547. The cubic root of 8139281378 is about 2011.5400668595.

The spelling of 8139281378 in words is "eight billion, one hundred thirty-nine million, two hundred eighty-one thousand, three hundred seventy-eight".