82178444 has 6 divisors (see below), whose sum is σ = 143812284. Its totient is φ = 41089220.

The previous prime is 82178423. The next prime is 82178449. The reversal of 82178444 is 44487128.

It is a happy number.

It is a super-2 number, since 2×82178444² = 13506593316522272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 82178398 and 82178407.

It is not an unprimeable number, because it can be changed into a prime (82178449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272302 + ... + 10272309.

It is an arithmetic number, because the mean of its divisors is an integer number (23968714).

Almost surely, 2^82178444 is an apocalyptic number.

It is an amenable number.

82178444 is a deficient number, since it is larger than the sum of its proper divisors (61633840).

82178444 is a wasteful number, since it uses less digits than its factorization.

82178444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20544615 (or 20544613 counting only the distinct ones).

The product of its digits is 57344, while the sum is 38.

The square root of 82178444 is about 9065.2327052316. The cubic root of 82178444 is about 434.7630611716.

It can be divided in two parts, 8217 and 8444, that added together give a palindrome (16661).

The spelling of 82178444 in words is "eighty-two million, one hundred seventy-eight thousand, four hundred forty-four".