87988897 has 2 divisors, whose sum is σ = 87988898. Its totient is φ = 87988896.

The previous prime is 87988861. The next prime is 87988903. The reversal of 87988897 is 79888978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63297936 + 24690961 = 7956^2 + 4969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87988897 is a prime.

It is not a weakly prime, because it can be changed into another prime (87988837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43994448 + 43994449.

It is an arithmetic number, because the mean of its divisors is an integer number (43994449).

Almost surely, 2^87988897 is an apocalyptic number.

It is an amenable number.

87988897 is a deficient number, since it is larger than the sum of its proper divisors (1).

87988897 is an equidigital number, since it uses as much as digits as its factorization.

87988897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16257024, while the sum is 64.

The square root of 87988897 is about 9380.2397090906. The cubic root of 87988897 is about 444.7773106218. Note that the first 3 decimals are identical.

The spelling of 87988897 in words is "eighty-seven million, nine hundred eighty-eight thousand, eight hundred ninety-seven".