74118721 has 8 divisors (see below), whose sum is σ = 75591144. Its totient is φ = 72654720.

The previous prime is 74118679. The next prime is 74118727. The reversal of 74118721 is 12781147.

It can be written as a sum of positive squares in 4 ways, for example, as 7924225 + 66194496 = 2815^2 + 8136^2 .

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 74118721 - 2¹³ = 74110529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74118727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17421 + ... + 21253.

It is an arithmetic number, because the mean of its divisors is an integer number (9448893).

Almost surely, 2^74118721 is an apocalyptic number.

It is an amenable number.

74118721 is a deficient number, since it is larger than the sum of its proper divisors (1472423).

74118721 is a wasteful number, since it uses less digits than its factorization.

74118721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4211.

The product of its digits is 3136, while the sum is 31.

The square root of 74118721 is about 8609.2230195297. The cubic root of 74118721 is about 420.0580437543.

Adding to 74118721 its reverse (12781147), we get a palindrome (86899868).

The spelling of 74118721 in words is "seventy-four million, one hundred eighteen thousand, seven hundred twenty-one".