87731287907 has 4 divisors (see below), whose sum is σ = 89386595280. Its totient is φ = 86075980536.

The previous prime is 87731287759. The next prime is 87731287937. The reversal of 87731287907 is 70978213778.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87731287907 - 2²⁴ = 87714510691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87731287937) 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, 827653607 + ... + 827653712.

It is an arithmetic number, because the mean of its divisors is an integer number (22346648820).

Almost surely, 2^87731287907 is an apocalyptic number.

87731287907 is a deficient number, since it is larger than the sum of its proper divisors (1655307373).

87731287907 is a wasteful number, since it uses less digits than its factorization.

87731287907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655307372.

The product of its (nonzero) digits is 8297856, while the sum is 59.

The spelling of 87731287907 in words is "eighty-seven billion, seven hundred thirty-one million, two hundred eighty-seven thousand, nine hundred seven".