638157063 has 4 divisors (see below), whose sum is σ = 850876088. Its totient is φ = 425438040.

The previous prime is 638157059. The next prime is 638157071. The reversal of 638157063 is 360751836.

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

It is not a de Polignac number, because 638157063 - 2² = 638157059 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 (638157043) 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, 106359508 + ... + 106359513.

It is an arithmetic number, because the mean of its divisors is an integer number (212719022).

Almost surely, 2^638157063 is an apocalyptic number.

638157063 is a deficient number, since it is larger than the sum of its proper divisors (212719025).

638157063 is a wasteful number, since it uses less digits than its factorization.

638157063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212719024.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 638157063 is about 25261.7707811626. The cubic root of 638157063 is about 860.9458958800.

The spelling of 638157063 in words is "six hundred thirty-eight million, one hundred fifty-seven thousand, sixty-three".