51273216 has 80 divisors (see below), whose sum is σ = 151813200. Its totient is φ = 17086464.

The previous prime is 51273199. The next prime is 51273239. The reversal of 51273216 is 61237215.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 51273216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11970 + ... + 15678.

It is an arithmetic number, because the mean of its divisors is an integer number (1897665).

Almost surely, 2^51273216 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 51273216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75906600).

51273216 is an abundant number, since it is smaller than the sum of its proper divisors (100539984).

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

51273216 is an equidigital number, since it uses as much as digits as its factorization.

51273216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3736 (or 3714 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 51273216 is about 7160.5318238243. The cubic root of 51273216 is about 371.5040216405.

The spelling of 51273216 in words is "fifty-one million, two hundred seventy-three thousand, two hundred sixteen".