72221436500 has 24 divisors (see below), whose sum is σ = 157731618408. Its totient is φ = 28888574400.

The previous prime is 72221436461. The next prime is 72221436593. The reversal of 72221436500 is 563412227.

It can be written as a sum of positive squares in 4 ways, for example, as 18806831044 + 53414605456 = 137138^2 + 231116^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72220937 + ... + 72221936.

It is an arithmetic number, because the mean of its divisors is an integer number (6572150767).

Almost surely, 2^72221436500 is an apocalyptic number.

It is an amenable number.

72221436500 is an abundant number, since it is smaller than the sum of its proper divisors (85510181908).

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

72221436500 is a wasteful number, since it uses less digits than its factorization.

72221436500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144442892 (or 144442880 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

Adding to 72221436500 its reverse (563412227), we get a palindrome (72784848727).

The spelling of 72221436500 in words is "seventy-two billion, two hundred twenty-one million, four hundred thirty-six thousand, five hundred".