8128312380 has 72 divisors (see below), whose sum is σ = 24686726064. Its totient is φ = 2164838400.

The previous prime is 8128312331. The next prime is 8128312421. The reversal of 8128312380 is 832138218.

It is a super-2 number, since 2×8128312380² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 118140 + ... + 173820.

Almost surely, 2^8128312380 is an apocalyptic number.

It is an amenable number.

8128312380 is an abundant number, since it is smaller than the sum of its proper divisors (16558413684).

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

8128312380 is a wasteful number, since it uses less digits than its factorization.

8128312380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56507 (or 56502 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 8128312380 is about 90157.1537926969. The cubic root of 8128312380 is about 2010.6360354414.

The spelling of 8128312380 in words is "eight billion, one hundred twenty-eight million, three hundred twelve thousand, three hundred eighty".