8128215408 has 20 divisors (see below), whose sum is σ = 20997889928. Its totient is φ = 2709405120.

The previous prime is 8128215373. The next prime is 8128215421. The reversal of 8128215408 is 8045128218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84668863 + ... + 84668958.

Almost surely, 2^8128215408 is an apocalyptic number.

It is an amenable number.

8128215408 is an abundant number, since it is smaller than the sum of its proper divisors (12869674520).

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

8128215408 is a wasteful number, since it uses less digits than its factorization.

8128215408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169337832 (or 169337826 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 39.

The square root of 8128215408 is about 90156.6159968308. The cubic root of 8128215408 is about 2010.6280396786.

The spelling of 8128215408 in words is "eight billion, one hundred twenty-eight million, two hundred fifteen thousand, four hundred eight".