638278167 has 16 divisors (see below), whose sum is σ = 860618880. Its totient is φ = 420744672.

The previous prime is 638278159. The next prime is 638278177. The reversal of 638278167 is 761872836.

It is not a de Polignac number, because 638278167 - 2³ = 638278159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638278177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182368 + ... + 185834.

It is an arithmetic number, because the mean of its divisors is an integer number (53788680).

Almost surely, 2^638278167 is an apocalyptic number.

638278167 is a deficient number, since it is larger than the sum of its proper divisors (222340713).

638278167 is a wasteful number, since it uses less digits than its factorization.

638278167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4142.

The product of its digits is 677376, while the sum is 48.

The square root of 638278167 is about 25264.1676490638. The cubic root of 638278167 is about 861.0003534230. Note that the first 3 decimals are identical.

The spelling of 638278167 in words is "six hundred thirty-eight million, two hundred seventy-eight thousand, one hundred sixty-seven".