81950763 has 8 divisors (see below), whose sum is σ = 112792576. Its totient is φ = 52871400.

The previous prime is 81950731. The next prime is 81950777. The reversal of 81950763 is 36705918.

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

It is not a de Polignac number, because 81950763 - 2⁵ = 81950731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81950783) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 440503 + ... + 440688.

It is an arithmetic number, because the mean of its divisors is an integer number (14099072).

Almost surely, 2^81950763 is an apocalyptic number.

81950763 is a deficient number, since it is larger than the sum of its proper divisors (30841813).

81950763 is a wasteful number, since it uses less digits than its factorization.

81950763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881225.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 81950763 is about 9052.6660713847. Note that the first 3 decimals coincide. The cubic root of 81950763 is about 434.3611761934.

The spelling of 81950763 in words is "eighty-one million, nine hundred fifty thousand, seven hundred sixty-three".