51336018 has 80 divisors (see below), whose sum is σ = 120748320. Its totient is φ = 16286400.

The previous prime is 51336011. The next prime is 51336049. The reversal of 51336018 is 81063315.

51336018 is a `hidden beast` number, since 51 + 3 + 3 + 601 + 8 = 666.

51336018 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 junction number, because it is equal to n+sod(n) for n = 51335982 and 51336000.

It is not an unprimeable number, because it can be changed into a prime (51336011) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 391813 + ... + 391943.

It is an arithmetic number, because the mean of its divisors is an integer number (1509354).

Almost surely, 2^51336018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51336018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60374160).

51336018 is an abundant number, since it is smaller than the sum of its proper divisors (69412302).

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

51336018 is a wasteful number, since it uses less digits than its factorization.

51336018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 236 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 51336018 is about 7164.9157706145. The cubic root of 51336018 is about 371.6556386583.

The spelling of 51336018 in words is "fifty-one million, three hundred thirty-six thousand, eighteen".