51728973 has 8 divisors (see below), whose sum is σ = 69168768. Its totient is φ = 34387584.

The previous prime is 51728947. The next prime is 51728983. The reversal of 51728973 is 37982715.

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

It is not a de Polignac number, because 51728973 - 2⁹ = 51728461 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51728933) 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, 23365 + ... + 25482.

It is an arithmetic number, because the mean of its divisors is an integer number (8646096).

Almost surely, 2^51728973 is an apocalyptic number.

It is an amenable number.

51728973 is a deficient number, since it is larger than the sum of its proper divisors (17439795).

51728973 is a wasteful number, since it uses less digits than its factorization.

51728973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49203.

The product of its digits is 105840, while the sum is 42.

The square root of 51728973 is about 7192.2856589543. The cubic root of 51728973 is about 372.6015170063.

The spelling of 51728973 in words is "fifty-one million, seven hundred twenty-eight thousand, nine hundred seventy-three".