51728155 has 16 divisors (see below), whose sum is σ = 62979840. Its totient is φ = 40783968.

The previous prime is 51728147. The next prime is 51728167. The reversal of 51728155 is 55182715.

It is a cyclic number.

It is not a de Polignac number, because 51728155 - 2³ = 51728147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51728155.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182644 + ... + 182926.

It is an arithmetic number, because the mean of its divisors is an integer number (3936240).

Almost surely, 2^51728155 is an apocalyptic number.

51728155 is a deficient number, since it is larger than the sum of its proper divisors (11251685).

51728155 is a wasteful number, since it uses less digits than its factorization.

51728155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690.

The product of its digits is 14000, while the sum is 34.

The square root of 51728155 is about 7192.2287922451. The cubic root of 51728155 is about 372.5995529900.

The spelling of 51728155 in words is "fifty-one million, seven hundred twenty-eight thousand, one hundred fifty-five".