72130945 has 8 divisors (see below), whose sum is σ = 88896744. Its totient is φ = 56145024.

The previous prime is 72130913. The next prime is 72130963. The reversal of 72130945 is 54903127.

It can be written as a sum of positive squares in 4 ways, for example, as 21678336 + 50452609 = 4656^2 + 7103^2 .

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 72130945 - 2⁵ = 72130913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194764 + ... + 195133.

It is an arithmetic number, because the mean of its divisors is an integer number (11112093).

Almost surely, 2^72130945 is an apocalyptic number.

It is an amenable number.

72130945 is a deficient number, since it is larger than the sum of its proper divisors (16765799).

72130945 is a wasteful number, since it uses less digits than its factorization.

72130945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389939.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 72130945 is about 8492.9938773085. The cubic root of 72130945 is about 416.2688124075.

The spelling of 72130945 in words is "seventy-two million, one hundred thirty thousand, nine hundred forty-five".