72945641 has 2 divisors, whose sum is σ = 72945642. Its totient is φ = 72945640.

The previous prime is 72945637. The next prime is 72945659. The reversal of 72945641 is 14654927.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46526041 + 26419600 = 6821^2 + 5140^2 .

It is a cyclic number.

It is not a de Polignac number, because 72945641 - 2² = 72945637 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 72945595 and 72945604.

It is not a weakly prime, because it can be changed into another prime (72945661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36472820 + 36472821.

It is an arithmetic number, because the mean of its divisors is an integer number (36472821).

Almost surely, 2^72945641 is an apocalyptic number.

It is an amenable number.

72945641 is a deficient number, since it is larger than the sum of its proper divisors (1).

72945641 is an equidigital number, since it uses as much as digits as its factorization.

72945641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 72945641 is about 8540.8220330364. The cubic root of 72945641 is about 417.8301565727.

The spelling of 72945641 in words is "seventy-two million, nine hundred forty-five thousand, six hundred forty-one".