81679736 has 16 divisors (see below), whose sum is σ = 154253400. Its totient is φ = 40545504.

The previous prime is 81679711. The next prime is 81679751. The reversal of 81679736 is 63797618.

It is a congruent number.

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, 35615 + ... + 37838.

Almost surely, 2^81679736 is an apocalyptic number.

It is an amenable number.

81679736 is a deficient number, since it is larger than the sum of its proper divisors (72573664).

81679736 is a wasteful number, since it uses less digits than its factorization.

81679736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73598 (or 73594 counting only the distinct ones).

The product of its digits is 381024, while the sum is 47.

The square root of 81679736 is about 9037.6842166564. The cubic root of 81679736 is about 433.8818085854.

The spelling of 81679736 in words is "eighty-one million, six hundred seventy-nine thousand, seven hundred thirty-six".