81360647 has 8 divisors (see below), whose sum is σ = 84104832. Its totient is φ = 78624000.

The previous prime is 81360611. The next prime is 81360661. The reversal of 81360647 is 74606318.

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

It is a cyclic number.

It is not a de Polignac number, because 81360647 - 2⁶ = 81360583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81360607) 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, 27647 + ... + 30447.

It is an arithmetic number, because the mean of its divisors is an integer number (10513104).

Almost surely, 2^81360647 is an apocalyptic number.

81360647 is a deficient number, since it is larger than the sum of its proper divisors (2744185).

81360647 is a wasteful number, since it uses less digits than its factorization.

81360647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3769.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 81360647 is about 9020.0136917856. The cubic root of 81360647 is about 433.3160722250.

The spelling of 81360647 in words is "eighty-one million, three hundred sixty thousand, six hundred forty-seven".