73663681 has 8 divisors (see below), whose sum is σ = 90663104. Its totient is φ = 58283280.

The previous prime is 73663673. The next prime is 73663697. The reversal of 73663681 is 18636637.

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 73663681 - 2³ = 73663673 is a prime.

It is a super-2 number, since 2×73663681² = 10852675796939522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (73663621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404655 + ... + 404836.

It is an arithmetic number, because the mean of its divisors is an integer number (11332888).

Almost surely, 2^73663681 is an apocalyptic number.

It is an amenable number.

73663681 is a deficient number, since it is larger than the sum of its proper divisors (16999423).

73663681 is a wasteful number, since it uses less digits than its factorization.

73663681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809511.

The product of its digits is 108864, while the sum is 40.

The square root of 73663681 is about 8582.7548607659. The cubic root of 73663681 is about 419.1966522207.

The spelling of 73663681 in words is "seventy-three million, six hundred sixty-three thousand, six hundred eighty-one".