81929695 has 8 divisors (see below), whose sum is σ = 100407744. Its totient is φ = 64149024.

The previous prime is 81929651. The next prime is 81929707. The reversal of 81929695 is 59692918.

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

It is a cyclic number.

It is not a de Polignac number, because 81929695 - 2¹¹ = 81927647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174084 + ... + 174553.

It is an arithmetic number, because the mean of its divisors is an integer number (12550968).

Almost surely, 2^81929695 is an apocalyptic number.

81929695 is a deficient number, since it is larger than the sum of its proper divisors (18478049).

81929695 is a wasteful number, since it uses less digits than its factorization.

81929695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348689.

The product of its digits is 349920, while the sum is 49.

The square root of 81929695 is about 9051.5023614867. The cubic root of 81929695 is about 434.3239509734.

The spelling of 81929695 in words is "eighty-one million, nine hundred twenty-nine thousand, six hundred ninety-five".