638552998 has 8 divisors (see below), whose sum is σ = 978208992. Its totient is φ = 312483336.

The previous prime is 638552987. The next prime is 638553011. The reversal of 638552998 is 899255836.

638552998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3396465 + ... + 3396652.

It is an arithmetic number, because the mean of its divisors is an integer number (122276124).

Almost surely, 2^638552998 is an apocalyptic number.

638552998 is a deficient number, since it is larger than the sum of its proper divisors (339655994).

638552998 is a wasteful number, since it uses less digits than its factorization.

638552998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6793166.

The product of its digits is 4665600, while the sum is 55.

The square root of 638552998 is about 25269.6062098324. The cubic root of 638552998 is about 861.1239127350.

The spelling of 638552998 in words is "six hundred thirty-eight million, five hundred fifty-two thousand, nine hundred ninety-eight".