72945401 has 2 divisors, whose sum is σ = 72945402. Its totient is φ = 72945400.

The previous prime is 72945391. The next prime is 72945403. The reversal of 72945401 is 10454927.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69973225 + 2972176 = 8365^2 + 1724^2 .

It is a cyclic number.

It is not a de Polignac number, because 72945401 - 2⁶ = 72945337 is a prime.

It is a Sophie Germain prime.

Together with 72945403, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (72945403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36472700 + 36472701.

It is an arithmetic number, because the mean of its divisors is an integer number (36472701).

Almost surely, 2^72945401 is an apocalyptic number.

It is an amenable number.

72945401 is a deficient number, since it is larger than the sum of its proper divisors (1).

72945401 is an equidigital number, since it uses as much as digits as its factorization.

72945401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 72945401 is about 8540.8079828550. The cubic root of 72945401 is about 417.8296983349.

The spelling of 72945401 in words is "seventy-two million, nine hundred forty-five thousand, four hundred one".