87998489 has 2 divisors, whose sum is σ = 87998490. Its totient is φ = 87998488.

The previous prime is 87998467. The next prime is 87998501. The reversal of 87998489 is 98489978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54878464 + 33120025 = 7408^2 + 5755^2 .

It is a cyclic number.

It is not a de Polignac number, because 87998489 - 2⁸ = 87998233 is a prime.

It is not a weakly prime, because it can be changed into another prime (87998419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43999244 + 43999245.

It is an arithmetic number, because the mean of its divisors is an integer number (43999245).

Almost surely, 2^87998489 is an apocalyptic number.

It is an amenable number.

87998489 is a deficient number, since it is larger than the sum of its proper divisors (1).

87998489 is an equidigital number, since it uses as much as digits as its factorization.

87998489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 62.

The square root of 87998489 is about 9380.7509827305. The cubic root of 87998489 is about 444.7934723160.

The spelling of 87998489 in words is "eighty-seven million, nine hundred ninety-eight thousand, four hundred eighty-nine".