87131806 has 16 divisors (see below), whose sum is σ = 134149680. Its totient is φ = 42419520.

The previous prime is 87131789. The next prime is 87131809. The reversal of 87131806 is 60813178.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87131809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69820 + ... + 71056.

It is an arithmetic number, because the mean of its divisors is an integer number (8384355).

Almost surely, 2^87131806 is an apocalyptic number.

87131806 is a deficient number, since it is larger than the sum of its proper divisors (47017874).

87131806 is a wasteful number, since it uses less digits than its factorization.

87131806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 87131806 is about 9334.4419222576. The cubic root of 87131806 is about 443.3284188625.

The spelling of 87131806 in words is "eighty-seven million, one hundred thirty-one thousand, eight hundred six".