8121736878 has 8 divisors (see below), whose sum is σ = 16243473768. Its totient is φ = 2707245624.

The previous prime is 8121736853. The next prime is 8121736879. The reversal of 8121736878 is 8786371218.

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

8121736878 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 8121736878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8121736879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 676811401 + ... + 676811412.

It is an arithmetic number, because the mean of its divisors is an integer number (2030434221).

Almost surely, 2^8121736878 is an apocalyptic number.

8121736878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

8121736878 is a wasteful number, since it uses less digits than its factorization.

8121736878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353622818.

The product of its digits is 903168, while the sum is 51.

The square root of 8121736878 is about 90120.6795247351. The cubic root of 8121736878 is about 2010.0937126180.

The spelling of 8121736878 in words is "eight billion, one hundred twenty-one million, seven hundred thirty-six thousand, eight hundred seventy-eight".