8118281840 has 20 divisors (see below), whose sum is σ = 18875005464. Its totient is φ = 3247312704.

The previous prime is 8118281839. The next prime is 8118281861. The reversal of 8118281840 is 481828118.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

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, 50739182 + ... + 50739341.

Almost surely, 2^8118281840 is an apocalyptic number.

8118281840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8118281840 is an abundant number, since it is smaller than the sum of its proper divisors (10756723624).

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

8118281840 is a wasteful number, since it uses less digits than its factorization.

8118281840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101478536 (or 101478530 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 41.

The square root of 8118281840 is about 90101.5085334313. The cubic root of 8118281840 is about 2009.8086366830.

The spelling of 8118281840 in words is "eight billion, one hundred eighteen million, two hundred eighty-one thousand, eight hundred forty".