72117322 has 16 divisors (see below), whose sum is σ = 109431432. Its totient is φ = 35642880.

The previous prime is 72117313. The next prime is 72117337. The reversal of 72117322 is 22371127.

It can be written as a sum of positive squares in 4 ways, for example, as 60699681 + 11417641 = 7791^2 + 3379^2 .

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 7 ways as a sum of consecutive naturals, for example, 75198 + ... + 76150.

Almost surely, 2^72117322 is an apocalyptic number.

72117322 is a deficient number, since it is larger than the sum of its proper divisors (37314110).

72117322 is a wasteful number, since it uses less digits than its factorization.

72117322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353.

The product of its digits is 1176, while the sum is 25.

The square root of 72117322 is about 8492.1918254359. The cubic root of 72117322 is about 416.2426045754.

Adding to 72117322 its reverse (22371127), we get a palindrome (94488449).

The spelling of 72117322 in words is "seventy-two million, one hundred seventeen thousand, three hundred twenty-two".