87722573 has 2 divisors, whose sum is σ = 87722574. Its totient is φ = 87722572.

The previous prime is 87722549. The next prime is 87722603. The reversal of 87722573 is 37522778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67535524 + 20187049 = 8218^2 + 4493^2 .

It is a cyclic number.

It is not a de Polignac number, because 87722573 - 2⁸ = 87722317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87722573.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87722543) 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, 43861286 + 43861287.

It is an arithmetic number, because the mean of its divisors is an integer number (43861287).

Almost surely, 2^87722573 is an apocalyptic number.

It is an amenable number.

87722573 is a deficient number, since it is larger than the sum of its proper divisors (1).

87722573 is an equidigital number, since it uses as much as digits as its factorization.

87722573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 164640, while the sum is 41.

The square root of 87722573 is about 9366.0329382295. The cubic root of 87722573 is about 444.3281077845.

The spelling of 87722573 in words is "eighty-seven million, seven hundred twenty-two thousand, five hundred seventy-three".