74636600809 has 9 divisors (see below), whose sum is σ = 75026837253.
Its totient is φ = 74248387872.
The previous prime is 74636600789. The next prime is 74636600833. The reversal of 74636600809 is 90800663647.
Multipling 74636600809 by its sum of digits (49), we get a square (3657193439641 = 19123792).
The square root of 74636600809 is 273197.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in 4 ways, for example, as 19330731225 + 55305869584 = 139035^2 + 235172^2
It is not a de Polignac number, because 74636600809 - 27 = 74636600681 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (74636600849) by changing a digit.
It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 62561517 + ... + 62562709.
Almost surely, 274636600809 is an apocalyptic number.
74636600809 is the 273197-th square number.
74636600809 is the 136599-th centered octagonal number.
It is an amenable number.
74636600809 is a deficient number, since it is larger than the sum of its proper divisors (390236444).
74636600809 is an frugal number, since it uses more digits than its factorization.
74636600809 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2844 (or 1422 counting only the distinct ones).
The product of its (nonzero) digits is 1306368, while the sum is 49.
The spelling of 74636600809 in words is "seventy-four billion, six hundred thirty-six million, six hundred thousand, eight hundred nine".