51440228 has 12 divisors (see below), whose sum is σ = 102880512. Its totient is φ = 22045800.

The previous prime is 51440203. The next prime is 51440237. The reversal of 51440228 is 82204415.

It is a happy number.

51440228 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 51440197 and 51440206.

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, 918548 + ... + 918603.

It is an arithmetic number, because the mean of its divisors is an integer number (8573376).

Almost surely, 2^51440228 is an apocalyptic number.

It is an amenable number.

51440228 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51440228 is a wasteful number, since it uses less digits than its factorization.

51440228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837162 (or 1837160 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 51440228 is about 7172.1843255733. The cubic root of 51440228 is about 371.9069505585.

The spelling of 51440228 in words is "fifty-one million, four hundred forty thousand, two hundred twenty-eight".