638232277 has 16 divisors (see below), whose sum is σ = 670298112. Its totient is φ = 607098240.

The previous prime is 638232271. The next prime is 638232289. The reversal of 638232277 is 772232836.

It is a cyclic number.

It is not a de Polignac number, because 638232277 - 2³ = 638232269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638232271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332673 + ... + 334585.

It is an arithmetic number, because the mean of its divisors is an integer number (41893632).

Almost surely, 2^638232277 is an apocalyptic number.

It is an amenable number.

638232277 is a deficient number, since it is larger than the sum of its proper divisors (32065835).

638232277 is a wasteful number, since it uses less digits than its factorization.

638232277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148.

The product of its digits is 169344, while the sum is 40.

The square root of 638232277 is about 25263.2594294560. The cubic root of 638232277 is about 860.9797186093.

The spelling of 638232277 in words is "six hundred thirty-eight million, two hundred thirty-two thousand, two hundred seventy-seven".