51728535 has 24 divisors (see below), whose sum is σ = 94938480. Its totient is φ = 25965312.

The previous prime is 51728531. The next prime is 51728561. The reversal of 51728535 is 53582715.

51728535 is a `hidden beast` number, since 51 + 72 + 8 + 535 = 666.

It is not a de Polignac number, because 51728535 - 2² = 51728531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51728535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51728531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33045 + ... + 34574.

It is an arithmetic number, because the mean of its divisors is an integer number (3955770).

Almost surely, 2^51728535 is an apocalyptic number.

51728535 is a deficient number, since it is larger than the sum of its proper divisors (43209945).

51728535 is a wasteful number, since it uses less digits than its factorization.

51728535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67647 (or 67644 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 51728535 is about 7192.2552095987. The cubic root of 51728535 is about 372.6004653718.

The spelling of 51728535 in words is "fifty-one million, seven hundred twenty-eight thousand, five hundred thirty-five".