81965758 has 8 divisors (see below), whose sum is σ = 140512752. Its totient is φ = 35128176.

The previous prime is 81965743. The next prime is 81965759. The reversal of 81965758 is 85756918.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81965759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2927335 + ... + 2927362.

It is an arithmetic number, because the mean of its divisors is an integer number (17564094).

Almost surely, 2^81965758 is an apocalyptic number.

81965758 is a deficient number, since it is larger than the sum of its proper divisors (58546994).

81965758 is a wasteful number, since it uses less digits than its factorization.

81965758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5854706.

The product of its digits is 604800, while the sum is 49.

The square root of 81965758 is about 9053.4942425563. The cubic root of 81965758 is about 434.3876670943.

The spelling of 81965758 in words is "eighty-one million, nine hundred sixty-five thousand, seven hundred fifty-eight".