87689573 has 2 divisors, whose sum is σ = 87689574. Its totient is φ = 87689572.

The previous prime is 87689557. The next prime is 87689597. The reversal of 87689573 is 37598678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71351809 + 16337764 = 8447^2 + 4042^2 .

It is a cyclic number.

It is not a de Polignac number, because 87689573 - 2⁴ = 87689557 is a prime.

It is a super-3 number, since 3×87689573³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87689543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43844786 + 43844787.

It is an arithmetic number, because the mean of its divisors is an integer number (43844787).

Almost surely, 2^87689573 is an apocalyptic number.

It is an amenable number.

87689573 is a deficient number, since it is larger than the sum of its proper divisors (1).

87689573 is an equidigital number, since it uses as much as digits as its factorization.

87689573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 53.

The square root of 87689573 is about 9364.2710874899. The cubic root of 87689573 is about 444.2723841317.

The spelling of 87689573 in words is "eighty-seven million, six hundred eighty-nine thousand, five hundred seventy-three".