51727728 has 80 divisors (see below), whose sum is σ = 151518080. Its totient is φ = 15075072.

The previous prime is 51727721. The next prime is 51727729. The reversal of 51727728 is 82772715.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51727721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9675 + ... + 14037.

It is an arithmetic number, because the mean of its divisors is an integer number (1893976).

Almost surely, 2^51727728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51727728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75759040).

51727728 is an abundant number, since it is smaller than the sum of its proper divisors (99790352).

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

51727728 is a wasteful number, since it uses less digits than its factorization.

51727728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4406 (or 4400 counting only the distinct ones).

The product of its digits is 54880, while the sum is 39.

The square root of 51727728 is about 7192.1991073663. The cubic root of 51727728 is about 372.5985277556.

The spelling of 51727728 in words is "fifty-one million, seven hundred twenty-seven thousand, seven hundred twenty-eight".