72328771 has 4 divisors (see below), whose sum is σ = 72509544. Its totient is φ = 72148000.

The previous prime is 72328759. The next prime is 72328799. The reversal of 72328771 is 17782327.

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 72328771 - 2⁹ = 72328259 is a prime.

It is a super-2 number, since 2×72328771² = 10462902228740882, which contains 22 as substring.

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 72328771.

It is not an unprimeable number, because it can be changed into a prime (72328741) 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, 89785 + ... + 90586.

It is an arithmetic number, because the mean of its divisors is an integer number (18127386).

Almost surely, 2^72328771 is an apocalyptic number.

72328771 is a deficient number, since it is larger than the sum of its proper divisors (180773).

72328771 is a wasteful number, since it uses less digits than its factorization.

72328771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180772.

The product of its digits is 32928, while the sum is 37.

The square root of 72328771 is about 8504.6323259739. The cubic root of 72328771 is about 416.6490173502.

The spelling of 72328771 in words is "seventy-two million, three hundred twenty-eight thousand, seven hundred seventy-one".