51217228 has 12 divisors (see below), whose sum is σ = 93527280. Its totient is φ = 24495152.

The previous prime is 51217211. The next prime is 51217259. The reversal of 51217228 is 82271215.

It is a junction number, because it is equal to n+sod(n) for n = 51217196 and 51217205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278263 + ... + 278446.

It is an arithmetic number, because the mean of its divisors is an integer number (7793940).

Almost surely, 2^51217228 is an apocalyptic number.

It is an amenable number.

51217228 is a deficient number, since it is larger than the sum of its proper divisors (42310052).

51217228 is a wasteful number, since it uses less digits than its factorization.

51217228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556736 (or 556734 counting only the distinct ones).

The product of its digits is 2240, while the sum is 28.

The square root of 51217228 is about 7156.6212698451. The cubic root of 51217228 is about 371.3687506083.

The spelling of 51217228 in words is "fifty-one million, two hundred seventeen thousand, two hundred twenty-eight".