72464321 has 2 divisors, whose sum is σ = 72464322. Its totient is φ = 72464320.

The previous prime is 72464291. The next prime is 72464323. The reversal of 72464321 is 12346427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56175025 + 16289296 = 7495^2 + 4036^2 .

It is an emirp because it is prime and its reverse (12346427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72464321 - 2⁶ = 72464257 is a prime.

It is a Sophie Germain prime.

Together with 72464323, 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 (72464323) by changing a digit.

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 as a sum of consecutive naturals, namely, 36232160 + 36232161.

It is an arithmetic number, because the mean of its divisors is an integer number (36232161).

Almost surely, 2^72464321 is an apocalyptic number.

It is an amenable number.

72464321 is a deficient number, since it is larger than the sum of its proper divisors (1).

72464321 is an equidigital number, since it uses as much as digits as its factorization.

72464321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 29.

The square root of 72464321 is about 8512.5977821109. The cubic root of 72464321 is about 416.9091329746.

The spelling of 72464321 in words is "seventy-two million, four hundred sixty-four thousand, three hundred twenty-one".