51308208 has 240 divisors, whose sum is σ = 181416960. Its totient is φ = 13592448.

The previous prime is 51308149. The next prime is 51308219. The reversal of 51308208 is 80280315.

It is a happy number.

51308208 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 47 ways as a sum of consecutive naturals, for example, 1091641 + ... + 1091687.

It is an arithmetic number, because the mean of its divisors is an integer number (755904).

Almost surely, 2^51308208 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 51308208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90708480).

51308208 is an abundant number, since it is smaller than the sum of its proper divisors (130108752).

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

51308208 is a wasteful number, since it uses less digits than its factorization.

51308208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 51308208 is about 7162.9748010167. The cubic root of 51308208 is about 371.5885148295.

The spelling of 51308208 in words is "fifty-one million, three hundred eight thousand, two hundred eight".