73731681 has 8 divisors (see below), whose sum is σ = 109232160. Its totient is φ = 49154436.

The previous prime is 73731677. The next prime is 73731731. The reversal of 73731681 is 18613737.

It is not a de Polignac number, because 73731681 - 2² = 73731677 is a prime.

It is a super-2 number, since 2×73731681² = 10872721566171522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (73731641) 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, 1365375 + ... + 1365428.

It is an arithmetic number, because the mean of its divisors is an integer number (13654020).

Almost surely, 2^73731681 is an apocalyptic number.

It is an amenable number.

73731681 is a deficient number, since it is larger than the sum of its proper divisors (35500479).

73731681 is a wasteful number, since it uses less digits than its factorization.

73731681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2730812 (or 2730806 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 73731681 is about 8586.7153790026. The cubic root of 73731681 is about 419.3256013637.

The spelling of 73731681 in words is "seventy-three million, seven hundred thirty-one thousand, six hundred eighty-one".