81632617 has 8 divisors (see below), whose sum is σ = 89245440. Its totient is φ = 74051760.

The previous prime is 81632611. The next prime is 81632627. The reversal of 81632617 is 71623618.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81632617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81632611) 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, 2478 + ... + 13015.

It is an arithmetic number, because the mean of its divisors is an integer number (11155680).

Almost surely, 2^81632617 is an apocalyptic number.

It is an amenable number.

81632617 is a deficient number, since it is larger than the sum of its proper divisors (7612823).

81632617 is a wasteful number, since it uses less digits than its factorization.

81632617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15983.

The product of its digits is 12096, while the sum is 34.

The square root of 81632617 is about 9035.0770334292. The cubic root of 81632617 is about 433.7983606768.

It can be divided in two parts, 816 and 32617, that added together give a palindrome (33433).

The spelling of 81632617 in words is "eighty-one million, six hundred thirty-two thousand, six hundred seventeen".