87847889 has 2 divisors, whose sum is σ = 87847890. Its totient is φ = 87847888.

The previous prime is 87847829. The next prime is 87847897. The reversal of 87847889 is 98874878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70140625 + 17707264 = 8375^2 + 4208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87847889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87847819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43923944 + 43923945.

It is an arithmetic number, because the mean of its divisors is an integer number (43923945).

Almost surely, 2^87847889 is an apocalyptic number.

It is an amenable number.

87847889 is a deficient number, since it is larger than the sum of its proper divisors (1).

87847889 is an equidigital number, since it uses as much as digits as its factorization.

87847889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7225344, while the sum is 59.

The square root of 87847889 is about 9372.7204695328. The cubic root of 87847889 is about 444.5395886144.

The spelling of 87847889 in words is "eighty-seven million, eight hundred forty-seven thousand, eight hundred eighty-nine".