8190991400 has 24 divisors (see below), whose sum is σ = 19044055470. Its totient is φ = 3276396480.

The previous prime is 8190991397. The next prime is 8190991421. The reversal of 8190991400 is 41990918.

It can be written as a sum of positive squares in 3 ways, for example, as 7348947076 + 842044324 = 85726^2 + 29018^2 .

It is a super-2 number, since 2×8190991400² (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 5 ways as a sum of consecutive naturals, for example, 20477279 + ... + 20477678.

Almost surely, 2^8190991400 is an apocalyptic number.

It is an amenable number.

8190991400 is an abundant number, since it is smaller than the sum of its proper divisors (10853064070).

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

8190991400 is a wasteful number, since it uses less digits than its factorization.

8190991400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40954973 (or 40954964 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 8190991400 is about 90504.0960399031. The cubic root of 8190991400 is about 2015.7909449017.

The spelling of 8190991400 in words is "eight billion, one hundred ninety million, nine hundred ninety-one thousand, four hundred".