73128232 has 8 divisors (see below), whose sum is σ = 137115450. Its totient is φ = 36564112.

The previous prime is 73128221. The next prime is 73128233. The reversal of 73128232 is 23282137.

It can be written as a sum of positive squares in only one way, i.e., 37773316 + 35354916 = 6146^2 + 5946^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 73128232.

It is not an unprimeable number, because it can be changed into a prime (73128233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4570507 + ... + 4570522.

Almost surely, 2^73128232 is an apocalyptic number.

It is an amenable number.

73128232 is a deficient number, since it is larger than the sum of its proper divisors (63987218).

73128232 is a wasteful number, since it uses less digits than its factorization.

73128232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9141035 (or 9141031 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 73128232 is about 8551.5046629234. The cubic root of 73128232 is about 418.1784911118.

The spelling of 73128232 in words is "seventy-three million, one hundred twenty-eight thousand, two hundred thirty-two".