86640625640 has 32 divisors (see below), whose sum is σ = 194958830880. Its totient is φ = 34653152832.

The previous prime is 86640625639. The next prime is 86640625661. The reversal of 86640625640 is 4652604668.

It is a super-2 number, since 2×86640625640² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386087 + ... + 567753.

It is an arithmetic number, because the mean of its divisors is an integer number (6092463465).

Almost surely, 2^86640625640 is an apocalyptic number.

It is an amenable number.

86640625640 is an abundant number, since it is smaller than the sum of its proper divisors (108318205240).

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

86640625640 is a wasteful number, since it uses less digits than its factorization.

86640625640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193601 (or 193597 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 47.

The spelling of 86640625640 in words is "eighty-six billion, six hundred forty million, six hundred twenty-five thousand, six hundred forty".