51818280 has 64 divisors (see below), whose sum is σ = 158025600. Its totient is φ = 13589760.

The previous prime is 51818251. The next prime is 51818293. The reversal of 51818280 is 8281815.

51818280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 15 ways as a sum of consecutive naturals, for example, 3781 + ... + 10859.

It is an arithmetic number, because the mean of its divisors is an integer number (2469150).

Almost surely, 2^51818280 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 51818280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79012800).

51818280 is an abundant number, since it is smaller than the sum of its proper divisors (106207320).

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

51818280 is a wasteful number, since it uses less digits than its factorization.

51818280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7154 (or 7150 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 51818280 is about 7198.4915086426. The cubic root of 51818280 is about 372.8158185248.

The spelling of 51818280 in words is "fifty-one million, eight hundred eighteen thousand, two hundred eighty".