81702982 has 4 divisors (see below), whose sum is σ = 122554476. Its totient is φ = 40851490.

The previous prime is 81702931. The next prime is 81702991. The reversal of 81702982 is 28920718.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28920718 = 2 ⋅14460359.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20425744 + ... + 20425747.

It is an arithmetic number, because the mean of its divisors is an integer number (30638619).

Almost surely, 2^81702982 is an apocalyptic number.

81702982 is a deficient number, since it is larger than the sum of its proper divisors (40851494).

81702982 is a wasteful number, since it uses less digits than its factorization.

81702982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40851493.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 81702982 is about 9038.9701847058. The cubic root of 81702982 is about 433.9229655085.

The spelling of 81702982 in words is "eighty-one million, seven hundred two thousand, nine hundred eighty-two".