638962689 has 8 divisors (see below), whose sum is σ = 852266880. Its totient is φ = 425816816.

The previous prime is 638962679. The next prime is 638962693. The reversal of 638962689 is 986269836.

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

It is a cyclic number.

It is not a de Polignac number, because 638962689 - 2⁴ = 638962673 is a prime.

It is a super-3 number, since 3×638962689³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (638962619) 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, 29817 + ... + 46550.

It is an arithmetic number, because the mean of its divisors is an integer number (106533360).

Almost surely, 2^638962689 is an apocalyptic number.

It is an amenable number.

638962689 is a deficient number, since it is larger than the sum of its proper divisors (213304191).

638962689 is a wasteful number, since it uses less digits than its factorization.

638962689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79159.

The product of its digits is 6718464, while the sum is 57.

The square root of 638962689 is about 25277.7113085817. The cubic root of 638962689 is about 861.3080369944.

The spelling of 638962689 in words is "six hundred thirty-eight million, nine hundred sixty-two thousand, six hundred eighty-nine".