73969613 has 4 divisors (see below), whose sum is σ = 74038140. Its totient is φ = 73901088.

The previous prime is 73969561. The next prime is 73969619. The reversal of 73969613 is 31696937.

It is a happy number.

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 7171684 + 66797929 = 2678^2 + 8173^2 .

It is a cyclic number.

It is not a de Polignac number, because 73969613 - 2²² = 69775309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73969619) 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, 32618 + ... + 34811.

It is an arithmetic number, because the mean of its divisors is an integer number (18509535).

Almost surely, 2^73969613 is an apocalyptic number.

It is an amenable number.

73969613 is a deficient number, since it is larger than the sum of its proper divisors (68527).

73969613 is a wasteful number, since it uses less digits than its factorization.

73969613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68526.

The product of its digits is 183708, while the sum is 44.

The square root of 73969613 is about 8600.5588771893. The cubic root of 73969613 is about 419.7761713646.

The spelling of 73969613 in words is "seventy-three million, nine hundred sixty-nine thousand, six hundred thirteen".