72231745 has 8 divisors (see below), whose sum is σ = 86831784. Its totient is φ = 57682944.

The previous prime is 72231713. The next prime is 72231781. The reversal of 72231745 is 54713227.

It can be written as a sum of positive squares in 4 ways, for example, as 27836176 + 44395569 = 5276^2 + 6663^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72231745 - 2⁵ = 72231713 is a prime.

It is a super-3 number, since 3×72231745³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9634 + ... + 15403.

It is an arithmetic number, because the mean of its divisors is an integer number (10853973).

Almost surely, 2^72231745 is an apocalyptic number.

It is an amenable number.

72231745 is a deficient number, since it is larger than the sum of its proper divisors (14600039).

72231745 is a wasteful number, since it uses less digits than its factorization.

72231745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25619.

The product of its digits is 11760, while the sum is 31.

The square root of 72231745 is about 8498.9261086328. The cubic root of 72231745 is about 416.4626282781.

The spelling of 72231745 in words is "seventy-two million, two hundred thirty-one thousand, seven hundred forty-five".