73317721 has 8 divisors (see below), whose sum is σ = 76624704. Its totient is φ = 70020720.

The previous prime is 73317691. The next prime is 73317733. The reversal of 73317721 is 12771337.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73317721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73317781) 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, 15306 + ... + 19516.

It is an arithmetic number, because the mean of its divisors is an integer number (9578088).

Almost surely, 2^73317721 is an apocalyptic number.

It is an amenable number.

73317721 is a deficient number, since it is larger than the sum of its proper divisors (3306983).

73317721 is a wasteful number, since it uses less digits than its factorization.

73317721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4991.

The product of its digits is 6174, while the sum is 31.

The square root of 73317721 is about 8562.5767733784. The cubic root of 73317721 is about 418.5393726217.

The spelling of 73317721 in words is "seventy-three million, three hundred seventeen thousand, seven hundred twenty-one".