87538889 has 2 divisors, whose sum is σ = 87538890. Its totient is φ = 87538888.

The previous prime is 87538883. The next prime is 87538931. The reversal of 87538889 is 98883578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60964864 + 26574025 = 7808^2 + 5155^2 .

It is a cyclic number.

It is not a de Polignac number, because 87538889 - 2²⁴ = 70761673 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (87538883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43769444 + 43769445.

It is an arithmetic number, because the mean of its divisors is an integer number (43769445).

Almost surely, 2^87538889 is an apocalyptic number.

It is an amenable number.

87538889 is a deficient number, since it is larger than the sum of its proper divisors (1).

87538889 is an equidigital number, since it uses as much as digits as its factorization.

87538889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3870720, while the sum is 56.

The square root of 87538889 is about 9356.2219405057. The cubic root of 87538889 is about 444.0177619846.

The spelling of 87538889 in words is "eighty-seven million, five hundred thirty-eight thousand, eight hundred eighty-nine".