72144773 has 2 divisors, whose sum is σ = 72144774. Its totient is φ = 72144772.

The previous prime is 72144769. The next prime is 72144791. The reversal of 72144773 is 37744127.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46267204 + 25877569 = 6802^2 + 5087^2 .

It is a cyclic number.

It is not a de Polignac number, because 72144773 - 2² = 72144769 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72144703) 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, 36072386 + 36072387.

It is an arithmetic number, because the mean of its divisors is an integer number (36072387).

Almost surely, 2^72144773 is an apocalyptic number.

It is an amenable number.

72144773 is a deficient number, since it is larger than the sum of its proper divisors (1).

72144773 is an equidigital number, since it uses as much as digits as its factorization.

72144773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32928, while the sum is 35.

The square root of 72144773 is about 8493.8079210681. The cubic root of 72144773 is about 416.2954112426.

The spelling of 72144773 in words is "seventy-two million, one hundred forty-four thousand, seven hundred seventy-three".