51645344 has 48 divisors (see below), whose sum is σ = 107866080. Its totient is φ = 24272640.

The previous prime is 51645331. The next prime is 51645361. The reversal of 51645344 is 44354615.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 51645344.

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, 104939 + ... + 105429.

It is an arithmetic number, because the mean of its divisors is an integer number (2247210).

Almost surely, 2^51645344 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 51645344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53933040).

51645344 is an abundant number, since it is smaller than the sum of its proper divisors (56220736).

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

51645344 is a wasteful number, since it uses less digits than its factorization.

51645344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 685 counting only the distinct ones).

The product of its digits is 28800, while the sum is 32.

The square root of 51645344 is about 7186.4695087365. The cubic root of 51645344 is about 372.4006167011.

Adding to 51645344 its reverse (44354615), we get a palindrome (95999959).

The spelling of 51645344 in words is "fifty-one million, six hundred forty-five thousand, three hundred forty-four".