51728187 has 16 divisors (see below), whose sum is σ = 79564032. Its totient is φ = 29281440.

The previous prime is 51728177. The next prime is 51728207. The reversal of 51728187 is 78182715.

It is not a de Polignac number, because 51728187 - 2¹² = 51724091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51728137) 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, 9264 + ... + 13757.

It is an arithmetic number, because the mean of its divisors is an integer number (4972752).

Almost surely, 2^51728187 is an apocalyptic number.

51728187 is a deficient number, since it is larger than the sum of its proper divisors (27835845).

51728187 is a wasteful number, since it uses less digits than its factorization.

51728187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23138.

The product of its digits is 31360, while the sum is 39.

The square root of 51728187 is about 7192.2310168681. The cubic root of 51728187 is about 372.5996298223.

It can be divided in two parts, 51728 and 187, that added together give a palindrome (51915).

The spelling of 51728187 in words is "fifty-one million, seven hundred twenty-eight thousand, one hundred eighty-seven".