72133427 has 4 divisors (see below), whose sum is σ = 72183936. Its totient is φ = 72082920.

The previous prime is 72133393. The next prime is 72133441. The reversal of 72133427 is 72433127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72133427 - 2¹² = 72129331 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72133427.

It is not an unprimeable number, because it can be changed into a prime (72133487) 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 in 3 ways as a sum of consecutive naturals, for example, 23048 + ... + 25989.

It is an arithmetic number, because the mean of its divisors is an integer number (18045984).

Almost surely, 2^72133427 is an apocalyptic number.

72133427 is a deficient number, since it is larger than the sum of its proper divisors (50509).

72133427 is a wasteful number, since it uses less digits than its factorization.

72133427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50508.

The product of its digits is 7056, while the sum is 29.

The square root of 72133427 is about 8493.1399964913. The cubic root of 72133427 is about 416.2735869063.

The spelling of 72133427 in words is "seventy-two million, one hundred thirty-three thousand, four hundred twenty-seven".