74405908309 has 4 divisors (see below), whose sum is σ = 74415782700. Its totient is φ = 74396033920.

The previous prime is 74405908289. The next prime is 74405908361. The reversal of 74405908309 is 90380950447.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90380950447 = 8209 ⋅11009983.

It can be written as a sum of positive squares in 2 ways, for example, as 21184802500 + 53221105809 = 145550^2 + 230697^2 .

It is a cyclic number.

It is not a de Polignac number, because 74405908309 - 2¹³ = 74405900117 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 (74405908399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4925884 + ... + 4940965.

It is an arithmetic number, because the mean of its divisors is an integer number (18603945675).

Almost surely, 2^74405908309 is an apocalyptic number.

It is an amenable number.

74405908309 is a deficient number, since it is larger than the sum of its proper divisors (9874391).

74405908309 is an equidigital number, since it uses as much as digits as its factorization.

74405908309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9874390.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 74405908309 in words is "seventy-four billion, four hundred five million, nine hundred eight thousand, three hundred nine".