51789689 has 8 divisors (see below), whose sum is σ = 59358720. Its totient is φ = 44263296.

The previous prime is 51789659. The next prime is 51789691. The reversal of 51789689 is 98698715.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-51789689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51789689.

It is not an unprimeable number, because it can be changed into a prime (51789659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8009 + ... + 12950.

It is an arithmetic number, because the mean of its divisors is an integer number (7419840).

Almost surely, 2^51789689 is an apocalyptic number.

It is an amenable number.

51789689 is a deficient number, since it is larger than the sum of its proper divisors (7569031).

51789689 is a wasteful number, since it uses less digits than its factorization.

51789689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21319.

The product of its digits is 1088640, while the sum is 53.

The square root of 51789689 is about 7196.5053324513. The cubic root of 51789689 is about 372.7472382343.

The spelling of 51789689 in words is "fifty-one million, seven hundred eighty-nine thousand, six hundred eighty-nine".