638264366 has 4 divisors (see below), whose sum is σ = 957396552. Its totient is φ = 319132182.

The previous prime is 638264339. The next prime is 638264377. The reversal of 638264366 is 663462836.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159566090 + ... + 159566093.

It is an arithmetic number, because the mean of its divisors is an integer number (239349138).

Almost surely, 2^638264366 is an apocalyptic number.

638264366 is a deficient number, since it is larger than the sum of its proper divisors (319132186).

638264366 is a wasteful number, since it uses less digits than its factorization.

638264366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319132185.

The product of its digits is 746496, while the sum is 44.

The square root of 638264366 is about 25263.8945137126. The cubic root of 638264366 is about 860.9941477945.

The spelling of 638264366 in words is "six hundred thirty-eight million, two hundred sixty-four thousand, three hundred sixty-six".