81677338 has 4 divisors (see below), whose sum is σ = 122516010. Its totient is φ = 40838668.

The previous prime is 81677329. The next prime is 81677341. The reversal of 81677338 is 83377618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83377618 = 2 ⋅41688809.

It can be written as a sum of positive squares in only one way, i.e., 61669609 + 20007729 = 7853^2 + 4473^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81677294 and 81677303.

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, 20419333 + ... + 20419336.

Almost surely, 2^81677338 is an apocalyptic number.

81677338 is a deficient number, since it is larger than the sum of its proper divisors (40838672).

81677338 is a wasteful number, since it uses less digits than its factorization.

81677338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40838671.

The product of its digits is 169344, while the sum is 43.

The square root of 81677338 is about 9037.5515489540. The cubic root of 81677338 is about 433.8775624945.

The spelling of 81677338 in words is "eighty-one million, six hundred seventy-seven thousand, three hundred thirty-eight".