77388856 has 8 divisors (see below), whose sum is σ = 145104120. Its totient is φ = 38694424.

The previous prime is 77388821. The next prime is 77388959. The reversal of 77388856 is 65888377.

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

It is a congruent number.

It is an unprimeable number.

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, 4836796 + ... + 4836811.

It is an arithmetic number, because the mean of its divisors is an integer number (18138015).

Almost surely, 2^77388856 is an apocalyptic number.

It is an amenable number.

77388856 is a deficient number, since it is larger than the sum of its proper divisors (67715264).

77388856 is a wasteful number, since it uses less digits than its factorization.

77388856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9673613 (or 9673609 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 52.

The square root of 77388856 is about 8797.0936109604. The cubic root of 77388856 is about 426.1470393986.

The spelling of 77388856 in words is "seventy-seven million, three hundred eighty-eight thousand, eight hundred fifty-six".