5621818788 has 36 divisors (see below), whose sum is σ = 14304833088. Its totient is φ = 1861527600.

The previous prime is 5621818759. The next prime is 5621818793. The reversal of 5621818788 is 8878181265.

5621818788 is a `hidden beast` number, since 5 + 621 + 8 + 1 + 8 + 7 + 8 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 511656 + ... + 522527.

Almost surely, 2^5621818788 is an apocalyptic number.

It is an amenable number.

5621818788 is an abundant number, since it is smaller than the sum of its proper divisors (8683014300).

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

5621818788 is a wasteful number, since it uses less digits than its factorization.

5621818788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034344 (or 1034339 counting only the distinct ones).

The product of its digits is 1720320, while the sum is 54.

The square root of 5621818788 is about 74978.7889206007. The cubic root of 5621818788 is about 1778.1113228987. Note that the first 3 decimals are identical.

The spelling of 5621818788 in words is "five billion, six hundred twenty-one million, eight hundred eighteen thousand, seven hundred eighty-eight".