87664133 has 2 divisors, whose sum is σ = 87664134. Its totient is φ = 87664132.

The previous prime is 87664099. The next prime is 87664139. The reversal of 87664133 is 33146678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80604484 + 7059649 = 8978^2 + 2657^2 .

It is a cyclic number.

It is not a de Polignac number, because 87664133 - 2⁶ = 87664069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87664139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43832066 + 43832067.

It is an arithmetic number, because the mean of its divisors is an integer number (43832067).

Almost surely, 2^87664133 is an apocalyptic number.

It is an amenable number.

87664133 is a deficient number, since it is larger than the sum of its proper divisors (1).

87664133 is an equidigital number, since it uses as much as digits as its factorization.

87664133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 38.

The square root of 87664133 is about 9362.9126344317. The cubic root of 87664133 is about 444.2294167175.

The spelling of 87664133 in words is "eighty-seven million, six hundred sixty-four thousand, one hundred thirty-three".