74671721 has 4 divisors (see below), whose sum is σ = 74941572. Its totient is φ = 74401872.

The previous prime is 74671711. The next prime is 74671733. The reversal of 74671721 is 12717647.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25110121 + 49561600 = 5011^2 + 7040^2 .

It is a cyclic number.

It is not a de Polignac number, because 74671721 - 2¹⁴ = 74655337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74671711) 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, 134510 + ... + 135063.

It is an arithmetic number, because the mean of its divisors is an integer number (18735393).

Almost surely, 2^74671721 is an apocalyptic number.

It is an amenable number.

74671721 is a deficient number, since it is larger than the sum of its proper divisors (269851).

74671721 is a wasteful number, since it uses less digits than its factorization.

74671721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269850.

The product of its digits is 16464, while the sum is 35.

The square root of 74671721 is about 8641.2800556399. The cubic root of 74671721 is about 421.1001411136.

The spelling of 74671721 in words is "seventy-four million, six hundred seventy-one thousand, seven hundred twenty-one".