638779463 has 8 divisors (see below), whose sum is σ = 734684832. Its totient is φ = 544036896.

The previous prime is 638779457. The next prime is 638779481. The reversal of 638779463 is 364977836.

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 638779463 - 2⁶ = 638779399 is a prime.

It is a super-3 number, since 3×638779463³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638779423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289520 + ... + 291717.

It is an arithmetic number, because the mean of its divisors is an integer number (91835604).

Almost surely, 2^638779463 is an apocalyptic number.

638779463 is a deficient number, since it is larger than the sum of its proper divisors (95905369).

638779463 is a wasteful number, since it uses less digits than its factorization.

638779463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581401.

The product of its digits is 4572288, while the sum is 53.

The square root of 638779463 is about 25274.0867886458. The cubic root of 638779463 is about 861.2257008809.

The spelling of 638779463 in words is "six hundred thirty-eight million, seven hundred seventy-nine thousand, four hundred sixty-three".