72221570 has 24 divisors (see below), whose sum is σ = 131278644. Its totient is φ = 28606656.

The previous prime is 72221561. The next prime is 72221647. The reversal of 72221570 is 7512227.

It can be written as a sum of positive squares in 6 ways, for example, as 35485849 + 36735721 = 5957^2 + 6061^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 246344 + ... + 246636.

Almost surely, 2^72221570 is an apocalyptic number.

72221570 is a deficient number, since it is larger than the sum of its proper divisors (59057074).

72221570 is a wasteful number, since it uses less digits than its factorization.

72221570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 72221570 is about 8498.3274825109. The cubic root of 72221570 is about 416.4430722125.

Adding to 72221570 its reverse (7512227), we get a palindrome (79733797).

The spelling of 72221570 in words is "seventy-two million, two hundred twenty-one thousand, five hundred seventy".