5638401220 has 48 divisors (see below), whose sum is σ = 12635965440. Its totient is φ = 2105961984.

The previous prime is 5638401211. The next prime is 5638401239. The reversal of 5638401220 is 221048365.

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, 22110 + ... + 108469.

It is an arithmetic number, because the mean of its divisors is an integer number (263249280).

Almost surely, 2^5638401220 is an apocalyptic number.

It is an amenable number.

5638401220 is an abundant number, since it is smaller than the sum of its proper divisors (6997564220).

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

5638401220 is a wasteful number, since it uses less digits than its factorization.

5638401220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130732 (or 130730 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 5638401220 is about 75089.2883173093. The cubic root of 5638401220 is about 1779.8578790708.

Adding to 5638401220 its reverse (221048365), we get a palindrome (5859449585).

The spelling of 5638401220 in words is "five billion, six hundred thirty-eight million, four hundred one thousand, two hundred twenty".