82178381 has 8 divisors (see below), whose sum is σ = 83814624. Its totient is φ = 80554320.

The previous prime is 82178359. The next prime is 82178413. The reversal of 82178381 is 18387128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82178381 - 2²² = 77984077 is a prime.

It is a super-2 number, since 2×82178381² = 13506572607562322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82178081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11231 + ... + 17043.

It is an arithmetic number, because the mean of its divisors is an integer number (10476828).

Almost surely, 2^82178381 is an apocalyptic number.

It is an amenable number.

82178381 is a deficient number, since it is larger than the sum of its proper divisors (1636243).

82178381 is a wasteful number, since it uses less digits than its factorization.

82178381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6091.

The product of its digits is 21504, while the sum is 38.

The square root of 82178381 is about 9065.2292304166. The cubic root of 82178381 is about 434.7629500716.

The spelling of 82178381 in words is "eighty-two million, one hundred seventy-eight thousand, three hundred eighty-one".