72128427 has 16 divisors (see below), whose sum is σ = 115695360. Its totient is φ = 39046752.

The previous prime is 72128417. The next prime is 72128431. The reversal of 72128427 is 72482127.

It is not a de Polignac number, because 72128427 - 2⁶ = 72128363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72128417) 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, 89988 + ... + 90785.

It is an arithmetic number, because the mean of its divisors is an integer number (7230960).

Almost surely, 2^72128427 is an apocalyptic number.

72128427 is a deficient number, since it is larger than the sum of its proper divisors (43566933).

72128427 is a wasteful number, since it uses less digits than its factorization.

72128427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180802.

The product of its digits is 12544, while the sum is 33.

The square root of 72128427 is about 8492.8456361811. The cubic root of 72128427 is about 416.2639685453.

The spelling of 72128427 in words is "seventy-two million, one hundred twenty-eight thousand, four hundred twenty-seven".