77227212 has 12 divisors (see below), whose sum is σ = 180196856. Its totient is φ = 25742400.

The previous prime is 77227193. The next prime is 77227217. The reversal of 77227212 is 21272277.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 77227212.

It is not an unprimeable number, because it can be changed into a prime (77227217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3217789 + ... + 3217812.

Almost surely, 2^77227212 is an apocalyptic number.

It is an amenable number.

77227212 is an abundant number, since it is smaller than the sum of its proper divisors (102969644).

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

77227212 is a wasteful number, since it uses less digits than its factorization.

77227212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6435608 (or 6435606 counting only the distinct ones).

The product of its digits is 5488, while the sum is 30.

The square root of 77227212 is about 8787.9014559791. The cubic root of 77227212 is about 425.8501313281.

Adding to 77227212 its reverse (21272277), we get a palindrome (98499489).

The spelling of 77227212 in words is "seventy-seven million, two hundred twenty-seven thousand, two hundred twelve".