87931895985 has 12 divisors (see below), whose sum is σ = 152415286452. Its totient is φ = 46897011168.

The previous prime is 87931895983. The next prime is 87931895993. The reversal of 87931895985 is 58959813978.

It can be written as a sum of positive squares in 2 ways, for example, as 17307770481 + 70624125504 = 131559^2 + 265752^2 .

It is not a de Polignac number, because 87931895985 - 2¹ = 87931895983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87931895983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 977021022 + ... + 977021111.

It is an arithmetic number, because the mean of its divisors is an integer number (12701273871).

Almost surely, 2^87931895985 is an apocalyptic number.

It is an amenable number.

87931895985 is a deficient number, since it is larger than the sum of its proper divisors (64483390467).

87931895985 is a wasteful number, since it uses less digits than its factorization.

87931895985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954042144 (or 1954042141 counting only the distinct ones).

The product of its digits is 195955200, while the sum is 72.

The spelling of 87931895985 in words is "eighty-seven billion, nine hundred thirty-one million, eight hundred ninety-five thousand, nine hundred eighty-five".