51389856 has 192 divisors, whose sum is σ = 177811200. Its totient is φ = 14128128.

The previous prime is 51389839. The next prime is 51389867. The reversal of 51389856 is 65898315.

51389856 is a `hidden beast` number, since 513 + 89 + 8 + 56 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175246 + ... + 175538.

It is an arithmetic number, because the mean of its divisors is an integer number (926100).

Almost surely, 2^51389856 is an apocalyptic number.

51389856 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51389856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88905600).

51389856 is an abundant number, since it is smaller than the sum of its proper divisors (126421344).

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

51389856 is a wasteful number, since it uses less digits than its factorization.

51389856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 334 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 51389856 is about 7168.6718435147. The cubic root of 51389856 is about 371.7855163175.

The spelling of 51389856 in words is "fifty-one million, three hundred eighty-nine thousand, eight hundred fifty-six".