51223280 has 40 divisors (see below), whose sum is σ = 123206400. Its totient is φ = 19781888.

The previous prime is 51223247. The next prime is 51223301. The reversal of 51223280 is 8232215.

51223280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8720 + ... + 13359.

It is an arithmetic number, because the mean of its divisors is an integer number (3080160).

Almost surely, 2^51223280 is an apocalyptic number.

It is an amenable number.

51223280 is an abundant number, since it is smaller than the sum of its proper divisors (71983120).

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

51223280 is a wasteful number, since it uses less digits than its factorization.

51223280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22121 (or 22115 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 51223280 is about 7157.0440825805. The cubic root of 51223280 is about 371.3833774260.

Adding to 51223280 its reverse (8232215), we get a palindrome (59455495).

The spelling of 51223280 in words is "fifty-one million, two hundred twenty-three thousand, two hundred eighty".