22740043644 has 72 divisors (see below), whose sum is σ = 59502817920. Its totient is φ = 7313846400.

The previous prime is 22740043643. The next prime is 22740043663. The reversal of 22740043644 is 44634004722.

22740043644 = T₃₉₅₈₇ + T₃₉₅₈₈ + ... + T₃₉₆₁₅.

22740043644 is a `hidden beast` number, since 2 + 2 + 7 + 4 + 0 + 0 + 4 + 3 + 644 = 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 = 22740043599 and 22740043608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22740043643) 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 23 ways as a sum of consecutive naturals, for example, 1811349 + ... + 1823859.

Almost surely, 2^22740043644 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 22740043644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29751408960).

22740043644 is an abundant number, since it is smaller than the sum of its proper divisors (36762774276).

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

22740043644 is a wasteful number, since it uses less digits than its factorization.

22740043644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14291 (or 14286 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 36.

The spelling of 22740043644 in words is "twenty-two billion, seven hundred forty million, forty-three thousand, six hundred forty-four".