87640655427 has 64 divisors (see below), whose sum is σ = 145474846720. Its totient is φ = 51781161600.

The previous prime is 87640655299. The next prime is 87640655449. The reversal of 87640655427 is 72455604678.

It is a happy number.

87640655427 is a `hidden beast` number, since 8 + 7 + 64 + 0 + 6 + 554 + 27 = 666.

It is not a de Polignac number, because 87640655427 - 2⁷ = 87640655299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87640655467) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 1350177 + ... + 1413597.

It is an arithmetic number, because the mean of its divisors is an integer number (2273044480).

Almost surely, 2^87640655427 is an apocalyptic number.

87640655427 is a deficient number, since it is larger than the sum of its proper divisors (57834191293).

87640655427 is a wasteful number, since it uses less digits than its factorization.

87640655427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63601 (or 63595 counting only the distinct ones).

The product of its (nonzero) digits is 11289600, while the sum is 54.

The spelling of 87640655427 in words is "eighty-seven billion, six hundred forty million, six hundred fifty-five thousand, four hundred twenty-seven".