51729918 has 8 divisors (see below), whose sum is σ = 103459848. Its totient is φ = 17243304.

The previous prime is 51729901. The next prime is 51729919. The reversal of 51729918 is 81992715.

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

51729918 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 51729918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51729919) 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, 4310821 + ... + 4310832.

It is an arithmetic number, because the mean of its divisors is an integer number (12932481).

Almost surely, 2^51729918 is an apocalyptic number.

51729918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51729918 is a wasteful number, since it uses less digits than its factorization.

51729918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8621658.

The product of its digits is 45360, while the sum is 42.

The square root of 51729918 is about 7192.3513540427. The cubic root of 51729918 is about 372.6037859237.

The spelling of 51729918 in words is "fifty-one million, seven hundred twenty-nine thousand, nine hundred eighteen".