8721675081 has 60 divisors (see below), whose sum is σ = 15219858192. Its totient is φ = 4983263208.

The previous prime is 8721675047. The next prime is 8721675091. The reversal of 8721675081 is 1805761278.

It is a happy number.

8721675081 is a `hidden beast` number, since 87 + 2 + 1 + 67 + 508 + 1 = 666.

It is not a de Polignac number, because 8721675081 - 2⁷ = 8721674953 is a prime.

It is a super-2 number, since 2×8721675081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8721675031) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 959946 + ... + 968988.

Almost surely, 2^8721675081 is an apocalyptic number.

8721675081 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8721675081 is a deficient number, since it is larger than the sum of its proper divisors (6498183111).

8721675081 is an frugal number, since it uses more digits than its factorization.

8721675081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9084 (or 9053 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The square root of 8721675081 is about 93389.9088820628. The cubic root of 8721675081 is about 2058.4167211108.

The spelling of 8721675081 in words is "eight billion, seven hundred twenty-one million, six hundred seventy-five thousand, eighty-one".