87269440644 has 36 divisors (see below), whose sum is σ = 220611622140. Its totient is φ = 29087984640.

The previous prime is 87269440637. The next prime is 87269440673. The reversal of 87269440644 is 44604496278.

87269440644 is a `hidden beast` number, since 87 + 2 + 69 + 440 + 64 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20246444100 + 67022996544 = 142290^2 + 258888^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 582292 + ... + 716660.

It is an arithmetic number, because the mean of its divisors is an integer number (6128100615).

Almost surely, 2^87269440644 is an apocalyptic number.

It is an amenable number.

87269440644 is an abundant number, since it is smaller than the sum of its proper divisors (133342181496).

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

87269440644 is a wasteful number, since it uses less digits than its factorization.

87269440644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152420 (or 152415 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 54.

The spelling of 87269440644 in words is "eighty-seven billion, two hundred sixty-nine million, four hundred forty thousand, six hundred forty-four".