5638991234 has 8 divisors (see below), whose sum is σ = 8474123388. Its totient is φ = 2814283440.

The previous prime is 5638991231. The next prime is 5638991249. The reversal of 5638991234 is 4321998365.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5609560609 + 29430625 = 74897^2 + 5425^2 .

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

It is not an unprimeable number, because it can be changed into a prime (5638991231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2604737 + ... + 2606900.

Almost surely, 2^5638991234 is an apocalyptic number.

5638991234 is a deficient number, since it is larger than the sum of its proper divisors (2835132154).

5638991234 is a wasteful number, since it uses less digits than its factorization.

5638991234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5212180.

The product of its digits is 1399680, while the sum is 50.

The square root of 5638991234 is about 75093.2169639842. The cubic root of 5638991234 is about 1779.9199595790.

The spelling of 5638991234 in words is "five billion, six hundred thirty-eight million, nine hundred ninety-one thousand, two hundred thirty-four".