72975445 has 4 divisors (see below), whose sum is σ = 87570540. Its totient is φ = 58380352.

The previous prime is 72975439. The next prime is 72975467. The reversal of 72975445 is 54457927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54457927 = 73 ⋅745999.

It can be written as a sum of positive squares in 2 ways, for example, as 55860676 + 17114769 = 7474^2 + 4137^2 .

It is a cyclic number.

It is not a de Polignac number, because 72975445 - 2³ = 72975437 is a prime.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 7297540 + ... + 7297549.

It is an arithmetic number, because the mean of its divisors is an integer number (21892635).

Almost surely, 2^72975445 is an apocalyptic number.

It is an amenable number.

72975445 is a deficient number, since it is larger than the sum of its proper divisors (14595095).

72975445 is a wasteful number, since it uses less digits than its factorization.

72975445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14595094.

The product of its digits is 352800, while the sum is 43.

The square root of 72975445 is about 8542.5666517739. The cubic root of 72975445 is about 417.8870542579.

The spelling of 72975445 in words is "seventy-two million, nine hundred seventy-five thousand, four hundred forty-five".