74561813 has 8 divisors (see below), whose sum is σ = 81670680. Its totient is φ = 67755520.

The previous prime is 74561801. The next prime is 74561819. The reversal of 74561813 is 31816547.

It can be written as a sum of positive squares in 4 ways, for example, as 8334769 + 66227044 = 2887^2 + 8138^2 .

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 74561813 - 2¹⁰ = 74560789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74561819) 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, 75128 + ... + 76113.

It is an arithmetic number, because the mean of its divisors is an integer number (10208835).

Almost surely, 2^74561813 is an apocalyptic number.

It is an amenable number.

74561813 is a deficient number, since it is larger than the sum of its proper divisors (7108867).

74561813 is a wasteful number, since it uses less digits than its factorization.

74561813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151287.

The product of its digits is 20160, while the sum is 35.

The square root of 74561813 is about 8634.9182393350. The cubic root of 74561813 is about 420.8934363547.

The spelling of 74561813 in words is "seventy-four million, five hundred sixty-one thousand, eight hundred thirteen".