638608467 has 8 divisors (see below), whose sum is σ = 973117696. Its totient is φ = 364919112.

The previous prime is 638608459. The next prime is 638608483. The reversal of 638608467 is 764806836.

It is a happy number.

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

It is not a de Polignac number, because 638608467 - 2³ = 638608459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638608427) 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 7 ways as a sum of consecutive naturals, for example, 15204943 + ... + 15204984.

It is an arithmetic number, because the mean of its divisors is an integer number (121639712).

Almost surely, 2^638608467 is an apocalyptic number.

638608467 is a deficient number, since it is larger than the sum of its proper divisors (334509229).

638608467 is a wasteful number, since it uses less digits than its factorization.

638608467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30409937.

The product of its (nonzero) digits is 1161216, while the sum is 48.

The square root of 638608467 is about 25270.7037298133. The cubic root of 638608467 is about 861.1488463476.

It can be divided in two parts, 63860 and 8467, that added together give a palindrome (72327).

The spelling of 638608467 in words is "six hundred thirty-eight million, six hundred eight thousand, four hundred sixty-seven".