87931309673 has 4 divisors (see below), whose sum is σ = 92559273360. Its totient is φ = 83303345988.

The previous prime is 87931309633. The next prime is 87931309681. The reversal of 87931309673 is 37690313978.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87931309673 - 2²⁸ = 87662874217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87931309603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2313981815 + ... + 2313981852.

It is an arithmetic number, because the mean of its divisors is an integer number (23139818340).

Almost surely, 2^87931309673 is an apocalyptic number.

It is an amenable number.

87931309673 is a deficient number, since it is larger than the sum of its proper divisors (4627963687).

87931309673 is a wasteful number, since it uses less digits than its factorization.

87931309673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4627963686.

The product of its (nonzero) digits is 5143824, while the sum is 56.

The spelling of 87931309673 in words is "eighty-seven billion, nine hundred thirty-one million, three hundred nine thousand, six hundred seventy-three".