51731228 has 12 divisors (see below), whose sum is σ = 90581400. Its totient is φ = 25850832.

The previous prime is 51731203. The next prime is 51731237. The reversal of 51731228 is 82213715.

51731228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51731228² = 5352239900775968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51731228.

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 3 ways as a sum of consecutive naturals, for example, 9098 + ... + 13646.

It is an arithmetic number, because the mean of its divisors is an integer number (7548450).

Almost surely, 2^51731228 is an apocalyptic number.

It is an amenable number.

51731228 is a deficient number, since it is larger than the sum of its proper divisors (38850172).

51731228 is a wasteful number, since it uses less digits than its factorization.

51731228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7396 (or 7394 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 51731228 is about 7192.4424224320. The cubic root of 51731228 is about 372.6069311496.

The spelling of 51731228 in words is "fifty-one million, seven hundred thirty-one thousand, two hundred twenty-eight".