81976958 has 64 divisors (see below), whose sum is σ = 157925376. Its totient is φ = 31104000.

The previous prime is 81976919. The next prime is 81976981. The reversal of 81976958 is 85967918.

It is a Curzon number.

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 in 31 ways as a sum of consecutive naturals, for example, 302363 + ... + 302633.

It is an arithmetic number, because the mean of its divisors is an integer number (2467584).

Almost surely, 2^81976958 is an apocalyptic number.

81976958 is a deficient number, since it is larger than the sum of its proper divisors (75948418).

81976958 is a wasteful number, since it uses less digits than its factorization.

81976958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369.

The product of its digits is 1088640, while the sum is 53.

The square root of 81976958 is about 9054.1127671352. The cubic root of 81976958 is about 434.4074514547.

It can be divided in two parts, 819 and 76958, that added together give a palindrome (77777).

The spelling of 81976958 in words is "eighty-one million, nine hundred seventy-six thousand, nine hundred fifty-eight".