82978 has 8 divisors (see below), whose sum is σ = 142272. Its totient is φ = 35556.

The previous prime is 82963. The next prime is 82981. The reversal of 82978 is 87928.

It is a happy number.

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

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2950 + ... + 2977.

It is an arithmetic number, because the mean of its divisors is an integer number (17784).

2⁸²⁹⁷⁸ is an apocalyptic number.

82978 is a deficient number, since it is larger than the sum of its proper divisors (59294).

82978 is a wasteful number, since it uses less digits than its factorization.

82978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5936.

The product of its digits is 8064, while the sum is 34.

The square root of 82978 is about 288.0590217299. The cubic root of 82978 is about 43.6168523356.

Subtracting from 82978 its sum of digits (34), we obtain a square (82944 = 288²).

Subtracting 82978 from its reverse (87928), we obtain a triangular number (4950 = T₉₉).

The spelling of 82978 in words is "eighty-two thousand, nine hundred seventy-eight".