51855408 has 120 divisors (see below), whose sum is σ = 166745280. Its totient is φ = 14878080.

The previous prime is 51855407. The next prime is 51855413. The reversal of 51855408 is 80455815.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51855407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29235 + ... + 30957.

It is an arithmetic number, because the mean of its divisors is an integer number (1389544).

Almost surely, 2^51855408 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 51855408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83372640).

51855408 is an abundant number, since it is smaller than the sum of its proper divisors (114889872).

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

51855408 is a wasteful number, since it uses less digits than its factorization.

51855408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1767 (or 1758 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The square root of 51855408 is about 7201.0699205049. The cubic root of 51855408 is about 372.9048385971.

The spelling of 51855408 in words is "fifty-one million, eight hundred fifty-five thousand, four hundred eight".