72731212 has 24 divisors (see below), whose sum is σ = 130888800. Its totient is φ = 35341440.

The previous prime is 72731209. The next prime is 72731273. The reversal of 72731212 is 21213727.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51289 + ... + 52687.

It is an arithmetic number, because the mean of its divisors is an integer number (5453700).

Almost surely, 2^72731212 is an apocalyptic number.

It is an amenable number.

72731212 is a deficient number, since it is larger than the sum of its proper divisors (58157588).

72731212 is a wasteful number, since it uses less digits than its factorization.

72731212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761 (or 1759 counting only the distinct ones).

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

The square root of 72731212 is about 8528.2596114330. The cubic root of 72731212 is about 417.4203407368.

Adding to 72731212 its reverse (21213727), we get a palindrome (93944939).

The spelling of 72731212 in words is "seventy-two million, seven hundred thirty-one thousand, two hundred twelve".