51730689 has 4 divisors (see below), whose sum is σ = 68974256. Its totient is φ = 34487124.

The previous prime is 51730687. The next prime is 51730697. The reversal of 51730689 is 98603715.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51730689 - 2¹ = 51730687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51730681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8621779 + ... + 8621784.

It is an arithmetic number, because the mean of its divisors is an integer number (17243564).

Almost surely, 2^51730689 is an apocalyptic number.

It is an amenable number.

51730689 is a deficient number, since it is larger than the sum of its proper divisors (17243567).

51730689 is a wasteful number, since it uses less digits than its factorization.

51730689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17243566.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 51730689 is about 7192.4049524481. The cubic root of 51730689 is about 372.6056370516.

The spelling of 51730689 in words is "fifty-one million, seven hundred thirty thousand, six hundred eighty-nine".