81882773 has 6 divisors (see below), whose sum is σ = 95251446. Its totient is φ = 70185192.

The previous prime is 81882763. The next prime is 81882797. The reversal of 81882773 is 37728818.

It can be written as a sum of positive squares in only one way, i.e., 43850884 + 38031889 = 6622^2 + 6167^2 .

It is not a de Polignac number, because 81882773 - 2¹² = 81878677 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 (81882743) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 835490 + ... + 835587.

It is an arithmetic number, because the mean of its divisors is an integer number (15875241).

Almost surely, 2^81882773 is an apocalyptic number.

It is an amenable number.

81882773 is a deficient number, since it is larger than the sum of its proper divisors (13368673).

81882773 is a wasteful number, since it uses less digits than its factorization.

81882773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671091 (or 1671084 counting only the distinct ones).

The product of its digits is 150528, while the sum is 44.

The square root of 81882773 is about 9048.9100448618. The cubic root of 81882773 is about 434.2410211713.

The spelling of 81882773 in words is "eighty-one million, eight hundred eighty-two thousand, seven hundred seventy-three".