72219577 has 2 divisors, whose sum is σ = 72219578. Its totient is φ = 72219576.

The previous prime is 72219571. The next prime is 72219593. The reversal of 72219577 is 77591227.

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., 71723961 + 495616 = 8469^2 + 704^2 .

It is a cyclic number.

It is not a de Polignac number, because 72219577 - 2³ = 72219569 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72219571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36109788 + 36109789.

It is an arithmetic number, because the mean of its divisors is an integer number (36109789).

Almost surely, 2^72219577 is an apocalyptic number.

It is an amenable number.

72219577 is a deficient number, since it is larger than the sum of its proper divisors (1).

72219577 is an equidigital number, since it uses as much as digits as its factorization.

72219577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61740, while the sum is 40.

The square root of 72219577 is about 8498.2102233353. The cubic root of 72219577 is about 416.4392415071.

The spelling of 72219577 in words is "seventy-two million, two hundred nineteen thousand, five hundred seventy-seven".