638142964 has 6 divisors (see below), whose sum is σ = 1116750194. Its totient is φ = 319071480.

The previous prime is 638142929. The next prime is 638142977. The reversal of 638142964 is 469241836.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 637966564 + 176400 = 25258^2 + 420^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 638142964.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79767867 + ... + 79767874.

Almost surely, 2^638142964 is an apocalyptic number.

It is an amenable number.

638142964 is a deficient number, since it is larger than the sum of its proper divisors (478607230).

638142964 is a wasteful number, since it uses less digits than its factorization.

638142964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159535745 (or 159535743 counting only the distinct ones).

The product of its digits is 248832, while the sum is 43.

The square root of 638142964 is about 25261.4917215908. The cubic root of 638142964 is about 860.9395554526.

The spelling of 638142964 in words is "six hundred thirty-eight million, one hundred forty-two thousand, nine hundred sixty-four".