72128075 has 12 divisors (see below), whose sum is σ = 92523840. Its totient is φ = 55712160.

The previous prime is 72128057. The next prime is 72128081. The reversal of 72128075 is 57082127.

It is not a de Polignac number, because 72128075 - 2¹⁰ = 72127051 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49019 + ... + 50468.

It is an arithmetic number, because the mean of its divisors is an integer number (7710320).

Almost surely, 2^72128075 is an apocalyptic number.

72128075 is a deficient number, since it is larger than the sum of its proper divisors (20395765).

72128075 is a wasteful number, since it uses less digits than its factorization.

72128075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99526 (or 99521 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 72128075 is about 8492.8249128308. The cubic root of 72128075 is about 416.2632913959.

The spelling of 72128075 in words is "seventy-two million, one hundred twenty-eight thousand, seventy-five".