74591729 has 4 divisors (see below), whose sum is σ = 75004020. Its totient is φ = 74179440.

The previous prime is 74591717. The next prime is 74591743. The reversal of 74591729 is 92719547.

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 13126129 + 61465600 = 3623^2 + 7840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74591729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 74591729.

It is not an unprimeable number, because it can be changed into a prime (74591779) 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, 205874 + ... + 206235.

It is an arithmetic number, because the mean of its divisors is an integer number (18751005).

Almost surely, 2^74591729 is an apocalyptic number.

It is an amenable number.

74591729 is a deficient number, since it is larger than the sum of its proper divisors (412291).

74591729 is a wasteful number, since it uses less digits than its factorization.

74591729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412290.

The product of its digits is 158760, while the sum is 44.

The square root of 74591729 is about 8636.6503344757. The cubic root of 74591729 is about 420.9497196983.

The spelling of 74591729 in words is "seventy-four million, five hundred ninety-one thousand, seven hundred twenty-nine".