72381784 has 24 divisors (see below), whose sum is σ = 144173340. Its totient is φ = 34060928.

The previous prime is 72381781. The next prime is 72381787. The reversal of 72381784 is 48718327.

It is an interprime number because it is at equal distance from previous prime (72381781) and next prime (72381787).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72381781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13342 + ... + 17965.

Almost surely, 2^72381784 is an apocalyptic number.

It is an amenable number.

72381784 is a deficient number, since it is larger than the sum of its proper divisors (71791556).

72381784 is a wasteful number, since it uses less digits than its factorization.

72381784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31347 (or 31326 counting only the distinct ones).

The product of its digits is 75264, while the sum is 40.

The square root of 72381784 is about 8507.7484683082. The cubic root of 72381784 is about 416.7507860741.

The spelling of 72381784 in words is "seventy-two million, three hundred eighty-one thousand, seven hundred eighty-four".