81466775 has 48 divisors (see below), whose sum is σ = 116659200. Its totient is φ = 55935360.

The previous prime is 81466769. The next prime is 81466783. The reversal of 81466775 is 57766418.

It is not a de Polignac number, because 81466775 - 2¹⁶ = 81401239 is a prime.

Its product of digits (282240) is a multiple of the sum of its prime factors (288).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 487742 + ... + 487908.

It is an arithmetic number, because the mean of its divisors is an integer number (2430400).

Almost surely, 2^81466775 is an apocalyptic number.

81466775 is a deficient number, since it is larger than the sum of its proper divisors (35192425).

81466775 is a wasteful number, since it uses less digits than its factorization.

81466775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 283 counting only the distinct ones).

The product of its digits is 282240, while the sum is 44.

The square root of 81466775 is about 9025.8946924945. The cubic root of 81466775 is about 433.5043982726.

The spelling of 81466775 in words is "eighty-one million, four hundred sixty-six thousand, seven hundred seventy-five".