5638195990 has 32 divisors (see below), whose sum is σ = 11972726784. Its totient is φ = 1870737120.

The previous prime is 5638195963. The next prime is 5638196009. The reversal of 5638195990 is 995918365.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1296954 + ... + 1301293.

It is an arithmetic number, because the mean of its divisors is an integer number (374147712).

Almost surely, 2^5638195990 is an apocalyptic number.

5638195990 is an abundant number, since it is smaller than the sum of its proper divisors (6334530794).

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

5638195990 is a wasteful number, since it uses less digits than its factorization.

5638195990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2598292.

The product of its (nonzero) digits is 2624400, while the sum is 55.

The square root of 5638195990 is about 75087.9217317939. The cubic root of 5638195990 is about 1779.8362840210.

The spelling of 5638195990 in words is "five billion, six hundred thirty-eight million, one hundred ninety-five thousand, nine hundred ninety".