81976738 has 8 divisors (see below), whose sum is σ = 128311488. Its totient is φ = 39206244.

The previous prime is 81976721. The next prime is 81976747. The reversal of 81976738 is 83767918.

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

It is a junction number, because it is equal to n+sod(n) for n = 81976691 and 81976700.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 891006 + ... + 891097.

It is an arithmetic number, because the mean of its divisors is an integer number (16038936).

Almost surely, 2^81976738 is an apocalyptic number.

81976738 is a deficient number, since it is larger than the sum of its proper divisors (46334750).

81976738 is a wasteful number, since it uses less digits than its factorization.

81976738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782128.

The product of its digits is 508032, while the sum is 49.

The square root of 81976738 is about 9054.1006179521. The cubic root of 81976738 is about 434.4070628507.

The spelling of 81976738 in words is "eighty-one million, nine hundred seventy-six thousand, seven hundred thirty-eight".