72175945 has 4 divisors (see below), whose sum is σ = 86611140. Its totient is φ = 57740752.

The previous prime is 72175919. The next prime is 72175969. The reversal of 72175945 is 54957127.

72175945 is nontrivially palindromic in base 14.

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

It can be written as a sum of positive squares in 2 ways, for example, as 40411449 + 31764496 = 6357^2 + 5636^2 .

It is a cyclic number.

It is not a de Polignac number, because 72175945 - 2¹¹ = 72173897 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 72175898 and 72175907.

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 3 ways as a sum of consecutive naturals, for example, 7217590 + ... + 7217599.

It is an arithmetic number, because the mean of its divisors is an integer number (21652785).

Almost surely, 2^72175945 is an apocalyptic number.

It is an amenable number.

72175945 is a deficient number, since it is larger than the sum of its proper divisors (14435195).

72175945 is a wasteful number, since it uses less digits than its factorization.

72175945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14435194.

The product of its digits is 88200, while the sum is 40.

The square root of 72175945 is about 8495.6427067056. The cubic root of 72175945 is about 416.3553596468.

The spelling of 72175945 in words is "seventy-two million, one hundred seventy-five thousand, nine hundred forty-five".