638741498 has 8 divisors (see below), whose sum is σ = 960827508. Its totient is φ = 318465664.

The previous prime is 638741491. The next prime is 638741503. The reversal of 638741498 is 894147836.

It can be written as a sum of positive squares in 2 ways, for example, as 530519089 + 108222409 = 23033^2 + 10403^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (638741491) 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, 451661 + ... + 453072.

Almost surely, 2^638741498 is an apocalyptic number.

638741498 is a deficient number, since it is larger than the sum of its proper divisors (322086010).

638741498 is a wasteful number, since it uses less digits than its factorization.

638741498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905088.

The product of its digits is 1161216, while the sum is 50.

The square root of 638741498 is about 25273.3357117734. The cubic root of 638741498 is about 861.2086386117.

The spelling of 638741498 in words is "six hundred thirty-eight million, seven hundred forty-one thousand, four hundred ninety-eight".