638876877 has 4 divisors (see below), whose sum is σ = 851835840. Its totient is φ = 425917916.

The previous prime is 638876863. The next prime is 638876879. The reversal of 638876877 is 778678836.

638876877 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 638876877 - 2¹² = 638872781 is a prime.

It is a super-3 number, since 3×638876877³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 638876877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638876879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106479477 + ... + 106479482.

It is an arithmetic number, because the mean of its divisors is an integer number (212958960).

Almost surely, 2^638876877 is an apocalyptic number.

It is an amenable number.

638876877 is a deficient number, since it is larger than the sum of its proper divisors (212958963).

638876877 is a wasteful number, since it uses less digits than its factorization.

638876877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212958962.

The product of its digits is 18966528, while the sum is 60.

The square root of 638876877 is about 25276.0138669055. The cubic root of 638876877 is about 861.2694776881.

The spelling of 638876877 in words is "six hundred thirty-eight million, eight hundred seventy-six thousand, eight hundred seventy-seven".