87708968649 has 27 divisors (see below), whose sum is σ = 134604684487. Its totient is φ = 55023601344.

The previous prime is 87708968569. The next prime is 87708968723. The reversal of 87708968649 is 94686980778.

The square root of 87708968649 is 296157.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 68285529225 + 19423439424 = 261315^2 + 139368^2 .

It is not a de Polignac number, because 87708968649 - 2¹¹ = 87708966601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87708963649) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 15101104 + ... + 15106910.

Almost surely, 2^87708968649 is an apocalyptic number.

87708968649 is the 296157-th square number.

87708968649 is the 148079-th centered octagonal number.

It is an amenable number.

87708968649 is a deficient number, since it is larger than the sum of its proper divisors (46895715838).

87708968649 is an frugal number, since it uses more digits than its factorization.

87708968649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11654 (or 5827 counting only the distinct ones).

The product of its (nonzero) digits is 292626432, while the sum is 72.

The spelling of 87708968649 in words is "eighty-seven billion, seven hundred eight million, nine hundred sixty-eight thousand, six hundred forty-nine".