81272670 has 32 divisors (see below), whose sum is σ = 195380640. Its totient is φ = 21636480.

The previous prime is 81272663. The next prime is 81272693. The reversal of 81272670 is 7627218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19360 + ... + 23180.

It is an arithmetic number, because the mean of its divisors is an integer number (6105645).

Almost surely, 2^81272670 is an apocalyptic number.

81272670 is an abundant number, since it is smaller than the sum of its proper divisors (114107970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81272670 is a wasteful number, since it uses less digits than its factorization.

81272670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4540.

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 81272670 is about 9015.1356063012. The cubic root of 81272670 is about 433.1598312641.

Adding to 81272670 its reverse (7627218), we get a palindrome (88899888).

The spelling of 81272670 in words is "eighty-one million, two hundred seventy-two thousand, six hundred seventy".