72706212 has 36 divisors (see below), whose sum is σ = 194597676. Its totient is φ = 22809600.

The previous prime is 72706211. The next prime is 72706237. The reversal of 72706212 is 21260727.

It can be written as a sum of positive squares in 2 ways, for example, as 30404196 + 42302016 = 5514^2 + 6504^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (72706211) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 58789 + ... + 60012.

It is an arithmetic number, because the mean of its divisors is an integer number (5405491).

Almost surely, 2^72706212 is an apocalyptic number.

It is an amenable number.

72706212 is an abundant number, since it is smaller than the sum of its proper divisors (121891464).

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

72706212 is a wasteful number, since it uses less digits than its factorization.

72706212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118828 (or 118823 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 72706212 is about 8526.7937702281. The cubic root of 72706212 is about 417.3725084324.

Adding to 72706212 its reverse (21260727), we get a palindrome (93966939).

The spelling of 72706212 in words is "seventy-two million, seven hundred six thousand, two hundred twelve".