81488105 has 8 divisors (see below), whose sum is σ = 99024000. Its totient is φ = 64364976.

The previous prime is 81488087. The next prime is 81488111. The reversal of 81488105 is 50188418.

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-81488105 is a prime.

It is a super-2 number, since 2×81488105² = 13280622512982050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102755 + ... + 103544.

It is an arithmetic number, because the mean of its divisors is an integer number (12378000).

Almost surely, 2^81488105 is an apocalyptic number.

It is an amenable number.

81488105 is a deficient number, since it is larger than the sum of its proper divisors (17535895).

81488105 is a wasteful number, since it uses less digits than its factorization.

81488105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206383.

The product of its (nonzero) digits is 10240, while the sum is 35.

The square root of 81488105 is about 9027.0762154753. The cubic root of 81488105 is about 433.5422289994.

The spelling of 81488105 in words is "eighty-one million, four hundred eighty-eight thousand, one hundred five".