81466587 has 8 divisors (see below), whose sum is σ = 120691280. Its totient is φ = 54311040.

The previous prime is 81466579. The next prime is 81466603. The reversal of 81466587 is 78566418.

It is a happy number.

81466587 is a `hidden beast` number, since 8 + 1 + 4 + 66 + 587 = 666.

It is not a de Polignac number, because 81466587 - 2³ = 81466579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81466577) 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, 1508614 + ... + 1508667.

It is an arithmetic number, because the mean of its divisors is an integer number (15086410).

Almost surely, 2^81466587 is an apocalyptic number.

81466587 is a deficient number, since it is larger than the sum of its proper divisors (39224693).

81466587 is a wasteful number, since it uses less digits than its factorization.

81466587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3017290 (or 3017284 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 81466587 is about 9025.8842780084. The cubic root of 81466587 is about 433.5040648079.

The spelling of 81466587 in words is "eighty-one million, four hundred sixty-six thousand, five hundred eighty-seven".