73128369 has 4 divisors (see below), whose sum is σ = 97504496. Its totient is φ = 48752244.

The previous prime is 73128353. The next prime is 73128383. The reversal of 73128369 is 96382137.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96382137 = 3 ⋅32127379.

It is not a de Polignac number, because 73128369 - 2⁴ = 73128353 is a prime.

It is a super-2 number, since 2×73128369² = 10695516705200322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73128389) 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, 12188059 + ... + 12188064.

It is an arithmetic number, because the mean of its divisors is an integer number (24376124).

Almost surely, 2^73128369 is an apocalyptic number.

It is an amenable number.

73128369 is a deficient number, since it is larger than the sum of its proper divisors (24376127).

73128369 is a wasteful number, since it uses less digits than its factorization.

73128369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24376126.

The product of its digits is 54432, while the sum is 39.

The square root of 73128369 is about 8551.5126732058. The cubic root of 73128369 is about 418.1787522531.

The spelling of 73128369 in words is "seventy-three million, one hundred twenty-eight thousand, three hundred sixty-nine".