81004587 has 8 divisors (see below), whose sum is σ = 108125136. Its totient is φ = 53943552.

The previous prime is 81004579. The next prime is 81004591. The reversal of 81004587 is 78540018.

It is a happy number.

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

It is not a de Polignac number, because 81004587 - 2³ = 81004579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81004577) 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, 11598 + ... + 17219.

It is an arithmetic number, because the mean of its divisors is an integer number (13515642).

Almost surely, 2^81004587 is an apocalyptic number.

81004587 is a deficient number, since it is larger than the sum of its proper divisors (27120549).

81004587 is a wasteful number, since it uses less digits than its factorization.

81004587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29757.

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 81004587 is about 9000.2548297257. The cubic root of 81004587 is about 432.6830383440.

The spelling of 81004587 in words is "eighty-one million, four thousand, five hundred eighty-seven".