77748867 has 12 divisors (see below), whose sum is σ = 128347440. Its totient is φ = 44427888.

The previous prime is 77748863. The next prime is 77748907. The reversal of 77748867 is 76884777.

It is a happy number.

It is not a de Polignac number, because 77748867 - 2² = 77748863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77748863) 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, 616992 + ... + 617117.

It is an arithmetic number, because the mean of its divisors is an integer number (10695620).

Almost surely, 2^77748867 is an apocalyptic number.

77748867 is a deficient number, since it is larger than the sum of its proper divisors (50598573).

77748867 is a wasteful number, since it uses less digits than its factorization.

77748867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234122 (or 1234119 counting only the distinct ones).

The product of its digits is 3687936, while the sum is 54.

The square root of 77748867 is about 8817.5317975043. The cubic root of 77748867 is about 426.8068257656.

It can be divided in two parts, 7774 and 8867, that added together give a square (16641 = 129²).

The spelling of 77748867 in words is "seventy-seven million, seven hundred forty-eight thousand, eight hundred sixty-seven".