72381785 has 16 divisors (see below), whose sum is σ = 99449856. Its totient is φ = 49541568.

The previous prime is 72381781. The next prime is 72381787. The reversal of 72381785 is 58718327.

It is a cyclic number.

It is not a de Polignac number, because 72381785 - 2² = 72381781 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72381781) 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, 21272 + ... + 24438.

It is an arithmetic number, because the mean of its divisors is an integer number (6215616).

Almost surely, 2^72381785 is an apocalyptic number.

It is an amenable number.

72381785 is a deficient number, since it is larger than the sum of its proper divisors (27068071).

72381785 is a wasteful number, since it uses less digits than its factorization.

72381785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3832.

The product of its digits is 94080, while the sum is 41.

The square root of 72381785 is about 8507.7485270781. The cubic root of 72381785 is about 416.7507879933.

The spelling of 72381785 in words is "seventy-two million, three hundred eighty-one thousand, seven hundred eighty-five".