8728715081 has 4 divisors (see below), whose sum is σ = 8747815572. Its totient is φ = 8709614592.

The previous prime is 8728715077. The next prime is 8728715087. The reversal of 8728715081 is 1805178278.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7825171600 + 903543481 = 88460^2 + 30059^2 .

It is a cyclic number.

It is not a de Polignac number, because 8728715081 - 2² = 8728715077 is a prime.

It is a super-2 number, since 2×8728715081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8728715087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9549560 + ... + 9550473.

It is an arithmetic number, because the mean of its divisors is an integer number (2186953893).

Almost surely, 2^8728715081 is an apocalyptic number.

It is an amenable number.

8728715081 is a deficient number, since it is larger than the sum of its proper divisors (19100491).

8728715081 is a wasteful number, since it uses less digits than its factorization.

8728715081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19100490.

The product of its (nonzero) digits is 250880, while the sum is 47.

The square root of 8728715081 is about 93427.5927175693. The cubic root of 8728715081 is about 2058.9704127772.

The spelling of 8728715081 in words is "eight billion, seven hundred twenty-eight million, seven hundred fifteen thousand, eighty-one".