89809987 has 2 divisors, whose sum is σ = 89809988. Its totient is φ = 89809986.

The previous prime is 89809969. The next prime is 89810023. The reversal of 89809987 is 78990898.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89809987 is a prime.

It is not a weakly prime, because it can be changed into another prime (89809927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44904993 + 44904994.

It is an arithmetic number, because the mean of its divisors is an integer number (44904994).

Almost surely, 2^89809987 is an apocalyptic number.

89809987 is a deficient number, since it is larger than the sum of its proper divisors (1).

89809987 is an equidigital number, since it uses as much as digits as its factorization.

89809987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 58.

The square root of 89809987 is about 9476.8131246743. The cubic root of 89809987 is about 447.8248727571.

The spelling of 89809987 in words is "eighty-nine million, eight hundred nine thousand, nine hundred eighty-seven".