81934763 has 4 divisors (see below), whose sum is σ = 85497168. Its totient is φ = 78372360.

The previous prime is 81934753. The next prime is 81934777. The reversal of 81934763 is 36743918.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36743918 = 2 ⋅18371959.

It is a cyclic number.

It is not a de Polignac number, because 81934763 - 2¹⁰ = 81933739 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81934763.

It is not an unprimeable number, because it can be changed into a prime (81934753) 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, 1781168 + ... + 1781213.

It is an arithmetic number, because the mean of its divisors is an integer number (21374292).

Almost surely, 2^81934763 is an apocalyptic number.

81934763 is a deficient number, since it is larger than the sum of its proper divisors (3562405).

81934763 is a wasteful number, since it uses less digits than its factorization.

81934763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3562404.

The product of its digits is 108864, while the sum is 41.

The square root of 81934763 is about 9051.7823106833. The cubic root of 81934763 is about 434.3329062465.

The spelling of 81934763 in words is "eighty-one million, nine hundred thirty-four thousand, seven hundred sixty-three".