81676138 has 8 divisors (see below), whose sum is σ = 123336900. Its totient is φ = 40563840.

The previous prime is 81676129. The next prime is 81676163. The reversal of 81676138 is 83167618.

It can be written as a sum of positive squares in 2 ways, for example, as 77211369 + 4464769 = 8787^2 + 2113^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 81676138.

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, 136743 + ... + 137338.

Almost surely, 2^81676138 is an apocalyptic number.

81676138 is a deficient number, since it is larger than the sum of its proper divisors (41660762).

81676138 is a wasteful number, since it uses less digits than its factorization.

81676138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274232.

The product of its digits is 48384, while the sum is 40.

The square root of 81676138 is about 9037.4851590473. The cubic root of 81676138 is about 433.8754376471.

The spelling of 81676138 in words is "eighty-one million, six hundred seventy-six thousand, one hundred thirty-eight".