77767772 has 12 divisors (see below), whose sum is σ = 136263960. Its totient is φ = 38835216.

The previous prime is 77767769. The next prime is 77767777. The reversal of 77767772 is 27776777.

It is a self number, because there is not a number n which added to its sum of digits gives 77767772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77767777) 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 3 ways as a sum of consecutive naturals, for example, 8447 + ... + 15062.

It is an arithmetic number, because the mean of its divisors is an integer number (11355330).

Almost surely, 2^77767772 is an apocalyptic number.

It is an amenable number.

77767772 is a deficient number, since it is larger than the sum of its proper divisors (58496188).

77767772 is a wasteful number, since it uses less digits than its factorization.

77767772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24340 (or 24338 counting only the distinct ones).

The product of its digits is 1411788, while the sum is 50.

The square root of 77767772 is about 8818.6037443577. The cubic root of 77767772 is about 426.8414163196.

The spelling of 77767772 in words is "seventy-seven million, seven hundred sixty-seven thousand, seven hundred seventy-two".