87827989 has 2 divisors, whose sum is σ = 87827990. Its totient is φ = 87827988.

The previous prime is 87827981. The next prime is 87828011. The reversal of 87827989 is 98972878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87272964 + 555025 = 9342^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 87827989 - 2³ = 87827981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87827981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43913994 + 43913995.

It is an arithmetic number, because the mean of its divisors is an integer number (43913995).

Almost surely, 2^87827989 is an apocalyptic number.

It is an amenable number.

87827989 is a deficient number, since it is larger than the sum of its proper divisors (1).

87827989 is an equidigital number, since it uses as much as digits as its factorization.

87827989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 58.

The square root of 87827989 is about 9371.6588179468. The cubic root of 87827989 is about 444.5060192026.

The spelling of 87827989 in words is "eighty-seven million, eight hundred twenty-seven thousand, nine hundred eighty-nine".