72448345 has 4 divisors (see below), whose sum is σ = 86938020. Its totient is φ = 57958672.

The previous prime is 72448319. The next prime is 72448399. The reversal of 72448345 is 54384427.

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 19289664 + 53158681 = 4392^2 + 7291^2 .

It is a cyclic number.

It is not a de Polignac number, because 72448345 - 2⁷ = 72448217 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7244830 + ... + 7244839.

It is an arithmetic number, because the mean of its divisors is an integer number (21734505).

Almost surely, 2^72448345 is an apocalyptic number.

It is an amenable number.

72448345 is a deficient number, since it is larger than the sum of its proper divisors (14489675).

72448345 is a wasteful number, since it uses less digits than its factorization.

72448345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14489674.

The product of its digits is 107520, while the sum is 37.

The square root of 72448345 is about 8511.6593564357. The cubic root of 72448345 is about 416.8784924711.

The spelling of 72448345 in words is "seventy-two million, four hundred forty-eight thousand, three hundred forty-five".