73128489 has 16 divisors (see below), whose sum is σ = 111713280. Its totient is φ = 41682960.

The previous prime is 73128487. The next prime is 73128491. The reversal of 73128489 is 98482137.

It is an interprime number because it is at equal distance from previous prime (73128487) and next prime (73128491).

It is not a de Polignac number, because 73128489 - 2¹ = 73128487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73128489.

It is not an unprimeable number, because it can be changed into a prime (73128487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4644 + ... + 12954.

It is an arithmetic number, because the mean of its divisors is an integer number (6982080).

Almost surely, 2^73128489 is an apocalyptic number.

It is an amenable number.

73128489 is a deficient number, since it is larger than the sum of its proper divisors (38584791).

73128489 is a wasteful number, since it uses less digits than its factorization.

73128489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8740.

The product of its digits is 96768, while the sum is 42.

The square root of 73128489 is about 8551.5196895055. The cubic root of 73128489 is about 418.1789809898.

The spelling of 73128489 in words is "seventy-three million, one hundred twenty-eight thousand, four hundred eighty-nine".