51685756 has 12 divisors (see below), whose sum is σ = 90563760. Its totient is φ = 25810400.

The previous prime is 51685741. The next prime is 51685769. The reversal of 51685756 is 65758615.

51685756 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 in 3 ways as a sum of consecutive naturals, for example, 4345 + ... + 11056.

It is an arithmetic number, because the mean of its divisors is an integer number (7546980).

Almost surely, 2^51685756 is an apocalyptic number.

It is an amenable number.

51685756 is a deficient number, since it is larger than the sum of its proper divisors (38878004).

51685756 is a wasteful number, since it uses less digits than its factorization.

51685756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16244 (or 16242 counting only the distinct ones).

The product of its digits is 252000, while the sum is 43.

The square root of 51685756 is about 7189.2806316070. The cubic root of 51685756 is about 372.4977247132.

It can be divided in two parts, 51685 and 756, that added together give a square (52441 = 229²).

The spelling of 51685756 in words is "fifty-one million, six hundred eighty-five thousand, seven hundred fifty-six".