8956721540 has 24 divisors (see below), whose sum is σ = 20255970840. Its totient is φ = 3307097088.

The previous prime is 8956721503. The next prime is 8956721563. The reversal of 8956721540 is 451276598.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 994014784 + 7962706756 = 31528^2 + 89234^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17224205 + ... + 17224724.

It is an arithmetic number, because the mean of its divisors is an integer number (843998785).

Almost surely, 2^8956721540 is an apocalyptic number.

It is an amenable number.

8956721540 is an abundant number, since it is smaller than the sum of its proper divisors (11299249300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8956721540 is a wasteful number, since it uses less digits than its factorization.

8956721540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34448951 (or 34448949 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 47.

The square root of 8956721540 is about 94639.9574175728. The cubic root of 8956721540 is about 2076.7442856673.

The spelling of 8956721540 in words is "eight billion, nine hundred fifty-six million, seven hundred twenty-one thousand, five hundred forty".