638323190 has 8 divisors (see below), whose sum is σ = 1148981760. Its totient is φ = 255329272.

The previous prime is 638323187. The next prime is 638323211. The reversal of 638323190 is 91323836.

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

It is a super-2 number, since 2×638323190² = 814912989783552200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 638323190.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31916150 + ... + 31916169.

It is an arithmetic number, because the mean of its divisors is an integer number (143622720).

Almost surely, 2^638323190 is an apocalyptic number.

638323190 is a deficient number, since it is larger than the sum of its proper divisors (510658570).

638323190 is a wasteful number, since it uses less digits than its factorization.

638323190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63832326.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 638323190 is about 25265.0586779449. The cubic root of 638323190 is about 861.0205974219.

The spelling of 638323190 in words is "six hundred thirty-eight million, three hundred twenty-three thousand, one hundred ninety".