87988861 has 2 divisors, whose sum is σ = 87988862. Its totient is φ = 87988860.

The previous prime is 87988853. The next prime is 87988897. The reversal of 87988861 is 16888978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63920025 + 24068836 = 7995^2 + 4906^2 .

It is a cyclic number.

It is not a de Polignac number, because 87988861 - 2³ = 87988853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87988801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43994430 + 43994431.

It is an arithmetic number, because the mean of its divisors is an integer number (43994431).

Almost surely, 2^87988861 is an apocalyptic number.

It is an amenable number.

87988861 is a deficient number, since it is larger than the sum of its proper divisors (1).

87988861 is an equidigital number, since it uses as much as digits as its factorization.

87988861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1548288, while the sum is 55.

The square root of 87988861 is about 9380.2377901629. The cubic root of 87988861 is about 444.7772499627. Note that the first 3 decimals are identical.

The spelling of 87988861 in words is "eighty-seven million, nine hundred eighty-eight thousand, eight hundred sixty-one".