55816785 has 24 divisors (see below), whose sum is σ = 99112104. Its totient is φ = 29041920.

The previous prime is 55816759. The next prime is 55816799. The reversal of 55816785 is 58761855.

55816785 is a `hidden beast` number, since 5 + 581 + 67 + 8 + 5 = 666.

55816785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5817744 + 49999041 = 2412^2 + 7071^2 .

It is not a de Polignac number, because 55816785 - 2⁸ = 55816529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 55816785.

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 in 23 ways as a sum of consecutive naturals, for example, 13282 + ... + 16971.

It is an arithmetic number, because the mean of its divisors is an integer number (4129671).

Almost surely, 2^55816785 is an apocalyptic number.

It is an amenable number.

55816785 is a deficient number, since it is larger than the sum of its proper divisors (43295319).

55816785 is a wasteful number, since it uses less digits than its factorization.

55816785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30305 (or 30302 counting only the distinct ones).

The product of its digits is 336000, while the sum is 45.

The square root of 55816785 is about 7471.0631773530. The cubic root of 55816785 is about 382.1685453619.

The spelling of 55816785 in words is "fifty-five million, eight hundred sixteen thousand, seven hundred eighty-five".