638086494 has 8 divisors (see below), whose sum is σ = 1276173000. Its totient is φ = 212695496.

The previous prime is 638086489. The next prime is 638086511. The reversal of 638086494 is 494680836.

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

638086494 is an admirable number.

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, 53173869 + ... + 53173880.

It is an arithmetic number, because the mean of its divisors is an integer number (159521625).

Almost surely, 2^638086494 is an apocalyptic number.

638086494 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638086494 is a wasteful number, since it uses less digits than its factorization.

638086494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106347754.

The product of its (nonzero) digits is 995328, while the sum is 48.

The square root of 638086494 is about 25260.3739877303. The cubic root of 638086494 is about 860.9141595285.

The spelling of 638086494 in words is "six hundred thirty-eight million, eighty-six thousand, four hundred ninety-four".