671728167 has 32 divisors (see below), whose sum is σ = 1087752960. Its totient is φ = 406308960.

The previous prime is 671728163. The next prime is 671728177. The reversal of 671728167 is 761827176.

It is not a de Polignac number, because 671728167 - 2² = 671728163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671728163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172413 + ... + 176265.

It is an arithmetic number, because the mean of its divisors is an integer number (33992280).

Almost surely, 2^671728167 is an apocalyptic number.

671728167 is a deficient number, since it is larger than the sum of its proper divisors (416024793).

671728167 is a wasteful number, since it uses less digits than its factorization.

671728167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4460 (or 4454 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 671728167 is about 25917.7191704826. The cubic root of 671728167 is about 875.7857071059.

Subtracting 671728167 from its reverse (761827176), we obtain a palindrome (90099009).

The spelling of 671728167 in words is "six hundred seventy-one million, seven hundred twenty-eight thousand, one hundred sixty-seven".