51453216 has 72 divisors (see below), whose sum is σ = 154037520. Its totient is φ = 16246656.

The previous prime is 51453187. The next prime is 51453217. The reversal of 51453216 is 61235415.

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 51453216.

It is not an unprimeable number, because it can be changed into a prime (51453217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 771 + ... + 10173.

It is an arithmetic number, because the mean of its divisors is an integer number (2139410).

Almost surely, 2^51453216 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 51453216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77018760).

51453216 is an abundant number, since it is smaller than the sum of its proper divisors (102584304).

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

51453216 is a wasteful number, since it uses less digits than its factorization.

51453216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9438 (or 9427 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 51453216 is about 7173.0897108568. The cubic root of 51453216 is about 371.9382485081.

The spelling of 51453216 in words is "fifty-one million, four hundred fifty-three thousand, two hundred sixteen".