87649564681 has 8 divisors (see below), whose sum is σ = 101581789824. Its totient is φ = 74070054240.

The previous prime is 87649564627. The next prime is 87649564693. The reversal of 87649564681 is 18646594678.

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

It is a de Polignac number, because none of the positive numbers 2^k-87649564681 is a prime.

It is a super-2 number, since 2×87649564681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87649564621) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 88178140 + ... + 88179133.

It is an arithmetic number, because the mean of its divisors is an integer number (12697723728).

Almost surely, 2^87649564681 is an apocalyptic number.

It is an amenable number.

87649564681 is a deficient number, since it is larger than the sum of its proper divisors (13932225143).

87649564681 is a wasteful number, since it uses less digits than its factorization.

87649564681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176357351.

The product of its digits is 69672960, while the sum is 64.

Subtracting from 87649564681 its product of digits (69672960), we obtain a square (87579891721 = 295939²).

The spelling of 87649564681 in words is "eighty-seven billion, six hundred forty-nine million, five hundred sixty-four thousand, six hundred eighty-one".