51718765 has 12 divisors (see below), whose sum is σ = 72195516. Its totient is φ = 35464128.

The previous prime is 51718739. The next prime is 51718769. The reversal of 51718765 is 56781715.

51718765 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 2 ways, for example, as 21215236 + 30503529 = 4606^2 + 5523^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51718765 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51718769) 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 in 11 ways as a sum of consecutive naturals, for example, 105304 + ... + 105793.

It is an arithmetic number, because the mean of its divisors is an integer number (6016293).

Almost surely, 2^51718765 is an apocalyptic number.

It is an amenable number.

51718765 is a deficient number, since it is larger than the sum of its proper divisors (20476751).

51718765 is a wasteful number, since it uses less digits than its factorization.

51718765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211116 (or 211109 counting only the distinct ones).

The product of its digits is 58800, while the sum is 40.

The square root of 51718765 is about 7191.5759747082. The cubic root of 51718765 is about 372.5770061357.

The spelling of 51718765 in words is "fifty-one million, seven hundred eighteen thousand, seven hundred sixty-five".