87632989 has 2 divisors, whose sum is σ = 87632990. Its totient is φ = 87632988.

The previous prime is 87632971. The next prime is 87633023. The reversal of 87632989 is 98923678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87516025 + 116964 = 9355^2 + 342^2 .

It is a cyclic number.

It is not a de Polignac number, because 87632989 - 2¹⁵ = 87600221 is a prime.

It is a super-3 number, since 3×87632989³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87632929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43816494 + 43816495.

It is an arithmetic number, because the mean of its divisors is an integer number (43816495).

Almost surely, 2^87632989 is an apocalyptic number.

It is an amenable number.

87632989 is a deficient number, since it is larger than the sum of its proper divisors (1).

87632989 is an equidigital number, since it uses as much as digits as its factorization.

87632989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 87632989 is about 9361.2493290159. The cubic root of 87632989 is about 444.1768040956.

The spelling of 87632989 in words is "eighty-seven million, six hundred thirty-two thousand, nine hundred eighty-nine".