51728093 has 4 divisors (see below), whose sum is σ = 54770940. Its totient is φ = 48685248.

The previous prime is 51728077. The next prime is 51728099. The reversal of 51728093 is 39082715.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21279769 + 30448324 = 4613^2 + 5518^2 .

It is a cyclic number.

It is not a de Polignac number, because 51728093 - 2⁴ = 51728077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51728099) 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, 1521398 + ... + 1521431.

It is an arithmetic number, because the mean of its divisors is an integer number (13692735).

Almost surely, 2^51728093 is an apocalyptic number.

It is an amenable number.

51728093 is a deficient number, since it is larger than the sum of its proper divisors (3042847).

51728093 is a wasteful number, since it uses less digits than its factorization.

51728093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042846.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 51728093 is about 7192.2244820361. The cubic root of 51728093 is about 372.5994041273.

The spelling of 51728093 in words is "fifty-one million, seven hundred twenty-eight thousand, ninety-three".