51228 has 18 divisors (see below), whose sum is σ = 129584. Its totient is φ = 17064.

The previous prime is 51217. The next prime is 51229. The reversal of 51228 is 82215.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 51228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51229) by changing a digit.

51228 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 676 + ... + 747.

2⁵¹²²⁸ is an apocalyptic number.

It is an amenable number.

51228 is an abundant number, since it is smaller than the sum of its proper divisors (78356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51228 is a wasteful number, since it uses less digits than its factorization.

51228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433 (or 1428 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 51228 is about 226.3360333663. The cubic root of 51228 is about 37.1394784191.

It can be divided in two parts, 51 and 228, that multiplied together give a triangular number (11628 = T₁₅₂).

The spelling of 51228 in words is "fifty-one thousand, two hundred twenty-eight".