638164467 has 64 divisors (see below), whose sum is σ = 1006992000. Its totient is φ = 398960640.

The previous prime is 638164453. The next prime is 638164469. The reversal of 638164467 is 764461836.

It is a happy number.

638164467 is a `hidden beast` number, since 638 + 1 + 6 + 4 + 4 + 6 + 7 = 666.

It is not a de Polignac number, because 638164467 - 2⁶ = 638164403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638164469) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4282909 + ... + 4283057.

It is an arithmetic number, because the mean of its divisors is an integer number (15734250).

Almost surely, 2^638164467 is an apocalyptic number.

638164467 is a deficient number, since it is larger than the sum of its proper divisors (368827533).

638164467 is a wasteful number, since it uses less digits than its factorization.

638164467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325 (or 319 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 638164467 is about 25261.9173262838. The cubic root of 638164467 is about 860.9492254777.

The spelling of 638164467 in words is "six hundred thirty-eight million, one hundred sixty-four thousand, four hundred sixty-seven".