72155128 has 16 divisors (see below), whose sum is σ = 135890280. Its totient is φ = 35917728.

The previous prime is 72155113. The next prime is 72155183. The reversal of 72155128 is 82155127.

It is a self number, because there is not a number n which added to its sum of digits gives 72155128.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18051 + ... + 21682.

Almost surely, 2^72155128 is an apocalyptic number.

It is an amenable number.

72155128 is a deficient number, since it is larger than the sum of its proper divisors (63735152).

72155128 is a wasteful number, since it uses less digits than its factorization.

72155128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39966 (or 39962 counting only the distinct ones).

The product of its digits is 5600, while the sum is 31.

The square root of 72155128 is about 8494.4174608975. The cubic root of 72155128 is about 416.3153273667.

Subtracting 72155128 from its reverse (82155127), we obtain a palindrome (9999999).

The spelling of 72155128 in words is "seventy-two million, one hundred fifty-five thousand, one hundred twenty-eight".