68784655 has 16 divisors (see below), whose sum is σ = 87120000. Its totient is φ = 51991200.

The previous prime is 68784647. The next prime is 68784671. The reversal of 68784655 is 55648786.

It is not a de Polignac number, because 68784655 - 2³ = 68784647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68784599 and 68784608.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 46680 + ... + 48130.

It is an arithmetic number, because the mean of its divisors is an integer number (5445000).

Almost surely, 2^68784655 is an apocalyptic number.

68784655 is a deficient number, since it is larger than the sum of its proper divisors (18335345).

68784655 is a wasteful number, since it uses less digits than its factorization.

68784655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1974.

The product of its digits is 1612800, while the sum is 49.

The square root of 68784655 is about 8293.6514877345. The cubic root of 68784655 is about 409.7294566559.

The spelling of 68784655 in words is "sixty-eight million, seven hundred eighty-four thousand, six hundred fifty-five".