81087587 has 8 divisors (see below), whose sum is σ = 92752896. Its totient is φ = 69442632.

The previous prime is 81087563. The next prime is 81087619. The reversal of 81087587 is 78578018.

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

It is not a de Polignac number, because 81087587 - 2¹⁴ = 81071203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81087527) 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, 4718 + ... + 13580.

It is an arithmetic number, because the mean of its divisors is an integer number (11594112).

Almost surely, 2^81087587 is an apocalyptic number.

81087587 is a deficient number, since it is larger than the sum of its proper divisors (11665309).

81087587 is a wasteful number, since it uses less digits than its factorization.

81087587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10177.

The product of its (nonzero) digits is 125440, while the sum is 44.

The square root of 81087587 is about 9004.8646297432. The cubic root of 81087587 is about 432.8307683870.

The spelling of 81087587 in words is "eighty-one million, eighty-seven thousand, five hundred eighty-seven".