51449856 has 104 divisors (see below), whose sum is σ = 141540480. Its totient is φ = 16613376.

The previous prime is 51449843. The next prime is 51449911. The reversal of 51449856 is 65894415.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 651225 + ... + 651303.

Almost surely, 2^51449856 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 51449856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70770240).

51449856 is an abundant number, since it is smaller than the sum of its proper divisors (90090624).

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

51449856 is an equidigital number, since it uses as much as digits as its factorization.

51449856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 137 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The square root of 51449856 is about 7172.8554983354. The cubic root of 51449856 is about 371.9301522230.

The spelling of 51449856 in words is "fifty-one million, four hundred forty-nine thousand, eight hundred fifty-six".