8158449690 has 36 divisors (see below), whose sum is σ = 21214197342. Its totient is φ = 2175358080.

The previous prime is 8158449671. The next prime is 8158449701. The reversal of 8158449690 is 969448518.

It can be written as a sum of positive squares in 3 ways, for example, as 6122906001 + 2035543689 = 78249^2 + 45117^2 .

It is a super-2 number, since 2×8158449690² (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 17 ways as a sum of consecutive naturals, for example, 852130 + ... + 861650.

Almost surely, 2^8158449690 is an apocalyptic number.

8158449690 is an abundant number, since it is smaller than the sum of its proper divisors (13055747652).

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

8158449690 is an frugal number, since it uses more digits than its factorization.

8158449690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19055 (or 9531 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The square root of 8158449690 is about 90324.1368073894. The cubic root of 8158449690 is about 2013.1179129034.

The spelling of 8158449690 in words is "eight billion, one hundred fifty-eight million, four hundred forty-nine thousand, six hundred ninety".