81850763 has 4 divisors (see below), whose sum is σ = 82012080. Its totient is φ = 81689448.

The previous prime is 81850753. The next prime is 81850799. The reversal of 81850763 is 36705818.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36705818 = 2 ⋅18352909.

It is a cyclic number.

It is not a de Polignac number, because 81850763 - 2²⁰ = 80802187 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81850723) 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 3 ways as a sum of consecutive naturals, for example, 79895 + ... + 80912.

It is an arithmetic number, because the mean of its divisors is an integer number (20503020).

Almost surely, 2^81850763 is an apocalyptic number.

81850763 is a deficient number, since it is larger than the sum of its proper divisors (161317).

81850763 is a wasteful number, since it uses less digits than its factorization.

81850763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161316.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 81850763 is about 9047.1411506619. The cubic root of 81850763 is about 434.1844286132.

The spelling of 81850763 in words is "eighty-one million, eight hundred fifty thousand, seven hundred sixty-three".