51663232 has 32 divisors (see below), whose sum is σ = 104682600. Its totient is φ = 25390080.

The previous prime is 51663229. The next prime is 51663233. The reversal of 51663232 is 23236615.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 51663232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51663233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4132 + ... + 10972.

Almost surely, 2^51663232 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 51663232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52341300).

51663232 is an abundant number, since it is smaller than the sum of its proper divisors (53019368).

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

51663232 is an equidigital number, since it uses as much as digits as its factorization.

51663232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6914 (or 6902 counting only the distinct ones).

The product of its digits is 6480, while the sum is 28.

The square root of 51663232 is about 7187.7139620327. The cubic root of 51663232 is about 372.4436069158.

Adding to 51663232 its reverse (23236615), we get a palindrome (74899847).

The spelling of 51663232 in words is "fifty-one million, six hundred sixty-three thousand, two hundred thirty-two".