81782982 has 24 divisors (see below), whose sum is σ = 178227504. Its totient is φ = 27102384.

The previous prime is 81782977. The next prime is 81783007. The reversal of 81782982 is 28928718.

It is a happy number.

It is a super-2 number, since 2×81782982² = 13376912289624648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10018 + ... + 16245.

It is an arithmetic number, because the mean of its divisors is an integer number (7426146).

Almost surely, 2^81782982 is an apocalyptic number.

81782982 is an abundant number, since it is smaller than the sum of its proper divisors (96444522).

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

81782982 is a wasteful number, since it uses less digits than its factorization.

81782982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26444 (or 26441 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 81782982 is about 9043.3943848535. The cubic root of 81782982 is about 434.0645454626.

The spelling of 81782982 in words is "eighty-one million, seven hundred eighty-two thousand, nine hundred eighty-two".