8126721970 has 32 divisors (see below), whose sum is σ = 14788221120. Its totient is φ = 3215298240.

The previous prime is 8126721961. The next prime is 8126722027. The reversal of 8126721970 is 791276218.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332116 + ... + 355744.

It is an arithmetic number, because the mean of its divisors is an integer number (462131910).

Almost surely, 2^8126721970 is an apocalyptic number.

8126721970 is a deficient number, since it is larger than the sum of its proper divisors (6661499150).

8126721970 is a wasteful number, since it uses less digits than its factorization.

8126721970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24010.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 8126721970 is about 90148.3331515342. Note that the first 3 decimals coincide. The cubic root of 8126721970 is about 2010.5048911935.

The spelling of 8126721970 in words is "eight billion, one hundred twenty-six million, seven hundred twenty-one thousand, nine hundred seventy".