81045763 has 8 divisors (see below), whose sum is σ = 82560960. Its totient is φ = 79535400.

The previous prime is 81045761. The next prime is 81045779. The reversal of 81045763 is 36754018.

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 81045763 - 2¹ = 81045761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81045761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61356 + ... + 62662.

It is an arithmetic number, because the mean of its divisors is an integer number (10320120).

Almost surely, 2^81045763 is an apocalyptic number.

81045763 is a deficient number, since it is larger than the sum of its proper divisors (1515197).

81045763 is a wasteful number, since it uses less digits than its factorization.

81045763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2417.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 81045763 is about 9002.5420298936. The cubic root of 81045763 is about 432.7563392913.

The spelling of 81045763 in words is "eighty-one million, forty-five thousand, seven hundred sixty-three".