87673889 has 2 divisors, whose sum is σ = 87673890. Its totient is φ = 87673888.

The previous prime is 87673871. The next prime is 87673891. The reversal of 87673889 is 98837678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67782289 + 19891600 = 8233^2 + 4460^2 .

It is a cyclic number.

It is not a de Polignac number, because 87673889 - 2¹² = 87669793 is a prime.

Together with 87673891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87672889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43836944 + 43836945.

It is an arithmetic number, because the mean of its divisors is an integer number (43836945).

Almost surely, 2^87673889 is an apocalyptic number.

It is an amenable number.

87673889 is a deficient number, since it is larger than the sum of its proper divisors (1).

87673889 is an equidigital number, since it uses as much as digits as its factorization.

87673889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 56.

The square root of 87673889 is about 9363.4336116619. The cubic root of 87673889 is about 444.2458952980.

The spelling of 87673889 in words is "eighty-seven million, six hundred seventy-three thousand, eight hundred eighty-nine".