51728145 has 32 divisors (see below), whose sum is σ = 95526912. Its totient is φ = 23412672.

The previous prime is 51728137. The next prime is 51728147. The reversal of 51728145 is 54182715.

It is not a de Polignac number, because 51728145 - 2³ = 51728137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51728147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8424 + ... + 13206.

It is an arithmetic number, because the mean of its divisors is an integer number (2985216).

Almost surely, 2^51728145 is an apocalyptic number.

It is an amenable number.

51728145 is a deficient number, since it is larger than the sum of its proper divisors (43798767).

51728145 is a wasteful number, since it uses less digits than its factorization.

51728145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4901.

The product of its digits is 11200, while the sum is 33.

The square root of 51728145 is about 7192.2280970503. The cubic root of 51728145 is about 372.5995289799.

The spelling of 51728145 in words is "fifty-one million, seven hundred twenty-eight thousand, one hundred forty-five".