73538681 has 4 divisors (see below), whose sum is σ = 73731072. Its totient is φ = 73346292.

The previous prime is 73538677. The next prime is 73538713. The reversal of 73538681 is 18683537.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 73538681 - 2² = 73538677 is a prime.

It is a super-2 number, since 2×73538681² = 10815875206439522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73568681) 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, 95621 + ... + 96386.

It is an arithmetic number, because the mean of its divisors is an integer number (18432768).

Almost surely, 2^73538681 is an apocalyptic number.

It is an amenable number.

73538681 is a deficient number, since it is larger than the sum of its proper divisors (192391).

73538681 is a wasteful number, since it uses less digits than its factorization.

73538681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192390.

The product of its digits is 120960, while the sum is 41.

The square root of 73538681 is about 8575.4697247439. The cubic root of 73538681 is about 418.9594061869.

The spelling of 73538681 in words is "seventy-three million, five hundred thirty-eight thousand, six hundred eighty-one".