22240426644 has 72 divisors (see below), whose sum is σ = 58310303688. Its totient is φ = 7141651200.

The previous prime is 22240426631. The next prime is 22240426661. The reversal of 22240426644 is 44662404222.

22240426644 is a `hidden beast` number, since 2 + 2 + 2 + 4 + 0 + 4 + 2 + 6 + 644 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5602522500 + 16637904144 = 74850^2 + 128988^2 .

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 = 22240426599 and 22240426608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51874 + ... + 217190.

It is an arithmetic number, because the mean of its divisors is an integer number (809865329).

Almost surely, 2^22240426644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22240426644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29155151844).

22240426644 is an abundant number, since it is smaller than the sum of its proper divisors (36069877044).

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

22240426644 is a wasteful number, since it uses less digits than its factorization.

22240426644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165465 (or 165460 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 36.

The spelling of 22240426644 in words is "twenty-two billion, two hundred forty million, four hundred twenty-six thousand, six hundred forty-four".