8972081728 has 14 divisors (see below), whose sum is σ = 17803974806. Its totient is φ = 4486040832.

The previous prime is 8972081711. The next prime is 8972081731. The reversal of 8972081728 is 8271802798.

It can be written as a sum of positive squares in only one way, i.e., 8159147584 + 812934144 = 90328^2 + 28512^2 .

It is a super-2 number, since 2×8972081728² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70094325 + ... + 70094452.

Almost surely, 2^8972081728 is an apocalyptic number.

It is an amenable number.

8972081728 is a deficient number, since it is larger than the sum of its proper divisors (8831893078).

8972081728 is a wasteful number, since it uses less digits than its factorization.

8972081728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140188789 (or 140188779 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 52.

The square root of 8972081728 is about 94721.0733047298. The cubic root of 8972081728 is about 2077.9307676059.

The spelling of 8972081728 in words is "eight billion, nine hundred seventy-two million, eighty-one thousand, seven hundred twenty-eight".