82181782 has 4 divisors (see below), whose sum is σ = 123272676. Its totient is φ = 41090890.

The previous prime is 82181777. The next prime is 82181809. The reversal of 82181782 is 28718128.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20545444 + ... + 20545447.

It is an arithmetic number, because the mean of its divisors is an integer number (30818169).

Almost surely, 2^82181782 is an apocalyptic number.

82181782 is a deficient number, since it is larger than the sum of its proper divisors (41090894).

82181782 is a wasteful number, since it uses less digits than its factorization.

82181782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41090893.

The product of its digits is 14336, while the sum is 37.

The square root of 82181782 is about 9065.4168133627. The cubic root of 82181782 is about 434.7689476279.

It can be divided in two parts, 8218 and 1782, that added together give a 4-th power (10000 = 10⁴).

The spelling of 82181782 in words is "eighty-two million, one hundred eighty-one thousand, seven hundred eighty-two".