72145757 has 2 divisors, whose sum is σ = 72145758. Its totient is φ = 72145756.

The previous prime is 72145747. The next prime is 72145781. The reversal of 72145757 is 75754127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66814276 + 5331481 = 8174^2 + 2309^2 .

It is a cyclic number.

It is not a de Polignac number, because 72145757 - 2⁶ = 72145693 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72145757.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72145747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36072878 + 36072879.

It is an arithmetic number, because the mean of its divisors is an integer number (36072879).

Almost surely, 2^72145757 is an apocalyptic number.

It is an amenable number.

72145757 is a deficient number, since it is larger than the sum of its proper divisors (1).

72145757 is an equidigital number, since it uses as much as digits as its factorization.

72145757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68600, while the sum is 38.

The square root of 72145757 is about 8493.8658454204. The cubic root of 72145757 is about 416.2973038853.

The spelling of 72145757 in words is "seventy-two million, one hundred forty-five thousand, seven hundred fifty-seven".