72445422 has 72 divisors (see below), whose sum is σ = 175154616. Its totient is φ = 19916736.

The previous prime is 72445409. The next prime is 72445427. The reversal of 72445422 is 22454427.

72445422 = 344² + 345² + ... + 636².

It is a self number, because there is not a number n which added to its sum of digits gives 72445422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72445427) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 247108 + ... + 247400.

It is an arithmetic number, because the mean of its divisors is an integer number (2432703).

Almost surely, 2^72445422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72445422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87577308).

72445422 is an abundant number, since it is smaller than the sum of its proper divisors (102709194).

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

72445422 is a wasteful number, since it uses less digits than its factorization.

72445422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370 (or 334 counting only the distinct ones).

The product of its digits is 17920, while the sum is 30.

The square root of 72445422 is about 8511.4876490541. The cubic root of 72445422 is about 416.8728859376.

Adding to 72445422 its reverse (22454427), we get a palindrome (94899849).

The spelling of 72445422 in words is "seventy-two million, four hundred forty-five thousand, four hundred twenty-two".