87866573 has 2 divisors, whose sum is σ = 87866574. Its totient is φ = 87866572.

The previous prime is 87866563. The next prime is 87866609. The reversal of 87866573 is 37566878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71690089 + 16176484 = 8467^2 + 4022^2 .

It is a cyclic number.

It is not a de Polignac number, because 87866573 - 2²² = 83672269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87866533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43933286 + 43933287.

It is an arithmetic number, because the mean of its divisors is an integer number (43933287).

Almost surely, 2^87866573 is an apocalyptic number.

It is an amenable number.

87866573 is a deficient number, since it is larger than the sum of its proper divisors (1).

87866573 is an equidigital number, since it uses as much as digits as its factorization.

87866573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 50.

The square root of 87866573 is about 9373.7171388943. The cubic root of 87866573 is about 444.5711021355.

The spelling of 87866573 in words is "eighty-seven million, eight hundred sixty-six thousand, five hundred seventy-three".