51776721 has 12 divisors (see below), whose sum is σ = 75104640. Its totient is φ = 34371960.

The previous prime is 51776701. The next prime is 51776723. The reversal of 51776721 is 12767715.

51776721 is a `hidden beast` number, since 517 + 76 + 72 + 1 = 666.

It is not a de Polignac number, because 51776721 - 2¹⁰ = 51775697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51776723) 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 11 ways as a sum of consecutive naturals, for example, 9885 + ... + 14186.

It is an arithmetic number, because the mean of its divisors is an integer number (6258720).

Almost surely, 2^51776721 is an apocalyptic number.

It is an amenable number.

51776721 is a deficient number, since it is larger than the sum of its proper divisors (23327919).

51776721 is a wasteful number, since it uses less digits than its factorization.

51776721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24316 (or 24313 counting only the distinct ones).

The product of its digits is 20580, while the sum is 36.

The square root of 51776721 is about 7195.6042831718. The cubic root of 51776721 is about 372.7161239991.

The spelling of 51776721 in words is "fifty-one million, seven hundred seventy-six thousand, seven hundred twenty-one".