638653428734 has 8 divisors (see below), whose sum is σ = 958026246768. Its totient is φ = 319311346480.

The previous prime is 638653428713. The next prime is 638653428793. The reversal of 638653428734 is 437824356836.

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

It is a super-3 number, since 3×638653428734³ (a number of 36 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7631927 + ... + 7715154.

It is an arithmetic number, because the mean of its divisors is an integer number (119753280846).

Almost surely, 2^638653428734 is an apocalyptic number.

638653428734 is a deficient number, since it is larger than the sum of its proper divisors (319372818034).

638653428734 is a wasteful number, since it uses less digits than its factorization.

638653428734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15367890.

The product of its digits is 69672960, while the sum is 59.

The spelling of 638653428734 in words is "six hundred thirty-eight billion, six hundred fifty-three million, four hundred twenty-eight thousand, seven hundred thirty-four".