73172128 has 12 divisors (see below), whose sum is σ = 144057690. Its totient is φ = 36586048.

The previous prime is 73172117. The next prime is 73172137. The reversal of 73172128 is 82127137.

It can be written as a sum of positive squares in only one way, i.e., 44997264 + 28174864 = 6708^2 + 5308^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 73172128.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1143283 + ... + 1143346.

Almost surely, 2^73172128 is an apocalyptic number.

It is an amenable number.

73172128 is a deficient number, since it is larger than the sum of its proper divisors (70885562).

73172128 is a wasteful number, since it uses less digits than its factorization.

73172128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2286639 (or 2286631 counting only the distinct ones).

The product of its digits is 4704, while the sum is 31.

The square root of 73172128 is about 8554.0708437562. The cubic root of 73172128 is about 418.2621464065.

The spelling of 73172128 in words is "seventy-three million, one hundred seventy-two thousand, one hundred twenty-eight".