73689121 has 12 divisors (see below), whose sum is σ = 81249700. Its totient is φ = 66781440.

The previous prime is 73689113. The next prime is 73689157. The reversal of 73689121 is 12198637.

It is the 3505-th star number.

It can be written as a sum of positive squares in 2 ways, for example, as 43560000 + 30129121 = 6600^2 + 5489^2 .

It is not a de Polignac number, because 73689121 - 2³ = 73689113 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

73689121 is a Rhonda number in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73689191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48745 + ... + 50233.

Almost surely, 2^73689121 is an apocalyptic number.

It is an amenable number.

73689121 is a deficient number, since it is larger than the sum of its proper divisors (7560579).

73689121 is a wasteful number, since it uses less digits than its factorization.

73689121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920 (or 1909 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 73689121 is about 8584.2367744605. The cubic root of 73689121 is about 419.2449036578.

The spelling of 73689121 in words is "seventy-three million, six hundred eighty-nine thousand, one hundred twenty-one".