87131578 has 8 divisors (see below), whose sum is σ = 130762368. Its totient is φ = 43544124.

The previous prime is 87131563. The next prime is 87131581. The reversal of 87131578 is 87513178.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 87131578.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5226 + ... + 14197.

It is an arithmetic number, because the mean of its divisors is an integer number (16345296).

Almost surely, 2^87131578 is an apocalyptic number.

87131578 is a deficient number, since it is larger than the sum of its proper divisors (43630790).

87131578 is a wasteful number, since it uses less digits than its factorization.

87131578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21668.

The product of its digits is 47040, while the sum is 40.

The square root of 87131578 is about 9334.4297094145. The cubic root of 87131578 is about 443.3280321726.

The spelling of 87131578 in words is "eighty-seven million, one hundred thirty-one thousand, five hundred seventy-eight".