77108728 has 8 divisors (see below), whose sum is σ = 144578880. Its totient is φ = 38554360.

The previous prime is 77108723. The next prime is 77108737. The reversal of 77108728 is 82780177.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77108723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4819288 + ... + 4819303.

It is an arithmetic number, because the mean of its divisors is an integer number (18072360).

Almost surely, 2^77108728 is an apocalyptic number.

It is an amenable number.

77108728 is a deficient number, since it is larger than the sum of its proper divisors (67470152).

77108728 is a wasteful number, since it uses less digits than its factorization.

77108728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9638597 (or 9638593 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 40.

The square root of 77108728 is about 8781.1575546735. The cubic root of 77108728 is about 425.6322364025.

The spelling of 77108728 in words is "seventy-seven million, one hundred eight thousand, seven hundred twenty-eight".