8128347840 has 112 divisors (see below), whose sum is σ = 28675035360. Its totient is φ = 2167557120.

The previous prime is 8128347833. The next prime is 8128347881. The reversal of 8128347840 is 487438218.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 461751 + ... + 479030.

Almost surely, 2^8128347840 is an apocalyptic number.

8128347840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8128347840 is an abundant number, since it is smaller than the sum of its proper divisors (20546687520).

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

8128347840 is a wasteful number, since it uses less digits than its factorization.

8128347840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940807 (or 940791 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The square root of 8128347840 is about 90157.3504490898. The cubic root of 8128347840 is about 2010.6389592566.

The spelling of 8128347840 in words is "eight billion, one hundred twenty-eight million, three hundred forty-seven thousand, eight hundred forty".