74317721 has 4 divisors (see below), whose sum is σ = 78229200. Its totient is φ = 70406244.

The previous prime is 74317709. The next prime is 74317729. The reversal of 74317721 is 12771347.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12771347 = 757 ⋅16871.

It is a cyclic number.

It is not a de Polignac number, because 74317721 - 2⁶ = 74317657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74317729) 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, 1955711 + ... + 1955748.

It is an arithmetic number, because the mean of its divisors is an integer number (19557300).

Almost surely, 2^74317721 is an apocalyptic number.

It is an amenable number.

74317721 is a deficient number, since it is larger than the sum of its proper divisors (3911479).

74317721 is a wasteful number, since it uses less digits than its factorization.

74317721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3911478.

The product of its digits is 8232, while the sum is 32.

The square root of 74317721 is about 8620.7726451867. The cubic root of 74317721 is about 420.4336431972.

The spelling of 74317721 in words is "seventy-four million, three hundred seventeen thousand, seven hundred twenty-one".