7715728081 has 8 divisors (see below), whose sum is σ = 7982766720. Its totient is φ = 7448754768.

The previous prime is 7715728073. The next prime is 7715728109. The reversal of 7715728081 is 1808275177.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7715728081 - 2³ = 7715728073 is a prime.

It is a super-2 number, since 2×7715728081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7715728381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452350 + ... + 469096.

It is an arithmetic number, because the mean of its divisors is an integer number (997845840).

Almost surely, 2^7715728081 is an apocalyptic number.

It is an amenable number.

7715728081 is a deficient number, since it is larger than the sum of its proper divisors (267038639).

7715728081 is a wasteful number, since it uses less digits than its factorization.

7715728081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32663.

The product of its (nonzero) digits is 219520, while the sum is 46.

The square root of 7715728081 is about 87839.2172153190. The cubic root of 7715728081 is about 1976.0244073850.

The spelling of 7715728081 in words is "seven billion, seven hundred fifteen million, seven hundred twenty-eight thousand, eighty-one".