51297228 has 72 divisors (see below), whose sum is σ = 139164480. Its totient is φ = 15874560.

The previous prime is 51297227. The next prime is 51297247. The reversal of 51297228 is 82279215.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51297192 and 51297201.

It is not an unprimeable number, because it can be changed into a prime (51297227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47818 + ... + 48878.

It is an arithmetic number, because the mean of its divisors is an integer number (1932840).

Almost surely, 2^51297228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51297228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69582240).

51297228 is an abundant number, since it is smaller than the sum of its proper divisors (87867252).

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

51297228 is a wasteful number, since it uses less digits than its factorization.

51297228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167 (or 1162 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 51297228 is about 7162.2083186682. The cubic root of 51297228 is about 371.5620061861.

The spelling of 51297228 in words is "fifty-one million, two hundred ninety-seven thousand, two hundred twenty-eight".