87520729 has 2 divisors, whose sum is σ = 87520730. Its totient is φ = 87520728.

The previous prime is 87520711. The next prime is 87520733. The reversal of 87520729 is 92702578.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52533504 + 34987225 = 7248^2 + 5915^2 .

It is a cyclic number.

It is not a de Polignac number, because 87520729 - 2¹¹ = 87518681 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87520691 and 87520700.

It is not a weakly prime, because it can be changed into another prime (87520739) 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, 43760364 + 43760365.

It is an arithmetic number, because the mean of its divisors is an integer number (43760365).

Almost surely, 2^87520729 is an apocalyptic number.

It is an amenable number.

87520729 is a deficient number, since it is larger than the sum of its proper divisors (1).

87520729 is an equidigital number, since it uses as much as digits as its factorization.

87520729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 87520729 is about 9355.2514129766. The cubic root of 87520729 is about 443.9870559357.

The spelling of 87520729 in words is "eighty-seven million, five hundred twenty thousand, seven hundred twenty-nine".