51768321 has 16 divisors (see below), whose sum is σ = 76536768. Its totient is φ = 30859200.

The previous prime is 51768289. The next prime is 51768323. The reversal of 51768321 is 12386715.

It is not a de Polignac number, because 51768321 - 2⁵ = 51768289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (51768323) by changing a digit.

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, 10846 + ... + 14871.

It is an arithmetic number, because the mean of its divisors is an integer number (4783548).

Almost surely, 2^51768321 is an apocalyptic number.

It is an amenable number.

51768321 is a deficient number, since it is larger than the sum of its proper divisors (24768447).

51768321 is a wasteful number, since it uses less digits than its factorization.

51768321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25792.

The product of its digits is 10080, while the sum is 33.

The square root of 51768321 is about 7195.0205698108. The cubic root of 51768321 is about 372.6959670334.

The spelling of 51768321 in words is "fifty-one million, seven hundred sixty-eight thousand, three hundred twenty-one".