87643867 has 2 divisors, whose sum is σ = 87643868. Its totient is φ = 87643866.

The previous prime is 87643859. The next prime is 87643889. The reversal of 87643867 is 76834678.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87643867 - 2³ = 87643859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87643867.

It is not a weakly prime, because it can be changed into another prime (87643667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43821933 + 43821934.

It is an arithmetic number, because the mean of its divisors is an integer number (43821934).

Almost surely, 2^87643867 is an apocalyptic number.

87643867 is a deficient number, since it is larger than the sum of its proper divisors (1).

87643867 is an equidigital number, since it uses as much as digits as its factorization.

87643867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 49.

The square root of 87643867 is about 9361.8303231793. The cubic root of 87643867 is about 444.1951820886.

The spelling of 87643867 in words is "eighty-seven million, six hundred forty-three thousand, eight hundred sixty-seven".