8121371280 has 160 divisors (see below), whose sum is σ = 27500525568. Its totient is φ = 1966272000.

The previous prime is 8121371263. The next prime is 8121371327. The reversal of 8121371280 is 821731218.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2773177 + ... + 2776103.

Almost surely, 2^8121371280 is an apocalyptic number.

8121371280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8121371280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13750262784).

8121371280 is an abundant number, since it is smaller than the sum of its proper divisors (19379154288).

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

8121371280 is a wasteful number, since it uses less digits than its factorization.

8121371280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4005 (or 3999 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 8121371280 is about 90118.6511217295. The cubic root of 8121371280 is about 2010.0635508730.

The spelling of 8121371280 in words is "eight billion, one hundred twenty-one million, three hundred seventy-one thousand, two hundred eighty".