77212112 has 20 divisors (see below), whose sum is σ = 150974340. Its totient is φ = 38251008.

The previous prime is 77212087. The next prime is 77212139. The reversal of 77212112 is 21121277.

It can be written as a sum of positive squares in 2 ways, for example, as 26460736 + 50751376 = 5144^2 + 7124^2 .

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, 20393 + ... + 23880.

It is an arithmetic number, because the mean of its divisors is an integer number (7548717).

Almost surely, 2^77212112 is an apocalyptic number.

It is an amenable number.

77212112 is a deficient number, since it is larger than the sum of its proper divisors (73762228).

77212112 is a wasteful number, since it uses less digits than its factorization.

77212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44390 (or 44384 counting only the distinct ones).

The product of its digits is 392, while the sum is 23.

The square root of 77212112 is about 8787.0422782641. The cubic root of 77212112 is about 425.8223744621.

Adding to 77212112 its reverse (21121277), we get a palindrome (98333389).

The spelling of 77212112 in words is "seventy-seven million, two hundred twelve thousand, one hundred twelve".