5638679594 has 4 divisors (see below), whose sum is σ = 8458019394. Its totient is φ = 2819339796.

The previous prime is 5638679591. The next prime is 5638679671. The reversal of 5638679594 is 4959768365.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4959768365 = 5 ⋅991953673.

It can be written as a sum of positive squares in only one way, i.e., 5619451369 + 19228225 = 74963^2 + 4385^2 .

It is not an unprimeable number, because it can be changed into a prime (5638679591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1409669897 + ... + 1409669900.

Almost surely, 2^5638679594 is an apocalyptic number.

5638679594 is a deficient number, since it is larger than the sum of its proper divisors (2819339800).

5638679594 is a wasteful number, since it uses less digits than its factorization.

5638679594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2819339799.

The product of its digits is 48988800, while the sum is 62.

The square root of 5638679594 is about 75091.1419143430. The cubic root of 5638679594 is about 1779.8871697618.

The spelling of 5638679594 in words is "five billion, six hundred thirty-eight million, six hundred seventy-nine thousand, five hundred ninety-four".