73989509 has 8 divisors (see below), whose sum is σ = 80779680. Its totient is φ = 67210000.

The previous prime is 73989497. The next prime is 73989521. The reversal of 73989509 is 90598937.

It is an interprime number because it is at equal distance from previous prime (73989497) and next prime (73989521).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 73989509 - 2⁴ = 73989493 is a prime.

It is a super-2 number, since 2×73989509² = 10948894884122162, which contains 22 as substring.

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 (73989569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21134 + ... + 24384.

It is an arithmetic number, because the mean of its divisors is an integer number (10097460).

Almost surely, 2^73989509 is an apocalyptic number.

It is an amenable number.

73989509 is a deficient number, since it is larger than the sum of its proper divisors (6790171).

73989509 is a wasteful number, since it uses less digits than its factorization.

73989509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5331.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 73989509 is about 8601.7154684400. The cubic root of 73989509 is about 419.8138044667.

The spelling of 73989509 in words is "seventy-three million, nine hundred eighty-nine thousand, five hundred nine".