8123961920 has 28 divisors (see below), whose sum is σ = 19345185084. Its totient is φ = 3249584640.

The previous prime is 8123961889. The next prime is 8123961947. The reversal of 8123961920 is 291693218.

It can be written as a sum of positive squares in 2 ways, for example, as 6213222976 + 1910738944 = 78824^2 + 43712^2 .

It is a super-2 number, since 2×8123961920² (a number of 21 digits) contains 22 as substring.

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, 12693371 + ... + 12694010.

Almost surely, 2^8123961920 is an apocalyptic number.

8123961920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8123961920 is an abundant number, since it is smaller than the sum of its proper divisors (11221223164).

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

8123961920 is a wasteful number, since it uses less digits than its factorization.

8123961920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25387398 (or 25387388 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 8123961920 is about 90133.0234708678. The cubic root of 8123961920 is about 2010.2772585199.

The spelling of 8123961920 in words is "eight billion, one hundred twenty-three million, nine hundred sixty-one thousand, nine hundred twenty".