72405222 has 8 divisors (see below), whose sum is σ = 144810456. Its totient is φ = 24135072.

The previous prime is 72405197. The next prime is 72405233. The reversal of 72405222 is 22250427.

It is a sphenic number, since it is the product of 3 distinct primes.

72405222 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 72405192 and 72405201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6033763 + ... + 6033774.

It is an arithmetic number, because the mean of its divisors is an integer number (18101307).

Almost surely, 2^72405222 is an apocalyptic number.

72405222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

72405222 is a wasteful number, since it uses less digits than its factorization.

72405222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12067542.

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 72405222 is about 8509.1258070380. The cubic root of 72405222 is about 416.7957640149.

Adding to 72405222 its reverse (22250427), we get a palindrome (94655649).

It can be divided in two parts, 72405 and 222, that added together give a palindrome (72627).

The spelling of 72405222 in words is "seventy-two million, four hundred five thousand, two hundred twenty-two".