81058587 has 8 divisors (see below), whose sum is σ = 108121104. Its totient is φ = 54017568.

The previous prime is 81058573. The next prime is 81058633. The reversal of 81058587 is 78585018.

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

It is not a de Polignac number, because 81058587 - 2²³ = 72669979 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (81058387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8673 + ... + 15405.

It is an arithmetic number, because the mean of its divisors is an integer number (13515138).

Almost surely, 2^81058587 is an apocalyptic number.

81058587 is a deficient number, since it is larger than the sum of its proper divisors (27062517).

81058587 is a wasteful number, since it uses less digits than its factorization.

81058587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10749.

The product of its (nonzero) digits is 89600, while the sum is 42.

The square root of 81058587 is about 9003.2542449939. The cubic root of 81058587 is about 432.7791633288.

The spelling of 81058587 in words is "eighty-one million, fifty-eight thousand, five hundred eighty-seven".