643167087 has 8 divisors (see below), whose sum is σ = 858367104. Its totient is φ = 428372568.

The previous prime is 643167079. The next prime is 643167089. The reversal of 643167087 is 780761346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 643167087 - 2³ = 643167079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643167089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97653 + ... + 104030.

It is an arithmetic number, because the mean of its divisors is an integer number (107295888).

Almost surely, 2^643167087 is an apocalyptic number.

643167087 is a deficient number, since it is larger than the sum of its proper divisors (215200017).

643167087 is a wasteful number, since it uses less digits than its factorization.

643167087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202749.

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 643167087 is about 25360.7390862333. The cubic root of 643167087 is about 863.1930547147.

Subtracting from 643167087 its sum of digits (42), we obtain a triangular number (643167045 = T₃₅₈₆₅).

The spelling of 643167087 in words is "six hundred forty-three million, one hundred sixty-seven thousand, eighty-seven".