5621640444 has 108 divisors (see below), whose sum is σ = 17502763824. Its totient is φ = 1511693568.

The previous prime is 5621640443. The next prime is 5621640449. The reversal of 5621640444 is 4440461265.

5621640444 is a `hidden beast` number, since 5 + 6 + 2 + 1 + 640 + 4 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 5621640399 and 5621640408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5621640443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 63744 + ... + 123719.

It is an arithmetic number, because the mean of its divisors is an integer number (162062628).

Almost surely, 2^5621640444 is an apocalyptic number.

It is an amenable number.

5621640444 is an abundant number, since it is smaller than the sum of its proper divisors (11881123380).

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

5621640444 is a wasteful number, since it uses less digits than its factorization.

5621640444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187504 (or 187492 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The square root of 5621640444 is about 74977.5996148183. The cubic root of 5621640444 is about 1778.0925200373.

The spelling of 5621640444 in words is "five billion, six hundred twenty-one million, six hundred forty thousand, four hundred forty-four".