51390208 has 36 divisors (see below), whose sum is σ = 103201560. Its totient is φ = 25539584.

The previous prime is 51390191. The next prime is 51390221. The reversal of 51390208 is 80209315.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49923 + ... + 50941.

It is an arithmetic number, because the mean of its divisors is an integer number (2866710).

Almost surely, 2^51390208 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 51390208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51600780).

51390208 is an abundant number, since it is smaller than the sum of its proper divisors (51811352).

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

51390208 is a wasteful number, since it uses less digits than its factorization.

51390208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232 (or 1218 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 51390208 is about 7168.6963947429. The cubic root of 51390208 is about 371.7863651763.

The spelling of 51390208 in words is "fifty-one million, three hundred ninety thousand, two hundred eight".