51996 has 24 divisors (see below), whose sum is σ = 138880. Its totient is φ = 14832.

The previous prime is 51991. The next prime is 52009. The reversal of 51996 is 69915.

51996 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226 + ... + 393.

2⁵¹⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

51996 is an abundant number, since it is smaller than the sum of its proper divisors (86884).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69440).

51996 is a wasteful number, since it uses less digits than its factorization.

51996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633 (or 631 counting only the distinct ones).

The product of its digits is 2430, while the sum is 30.

The square root of 51996 is about 228.0263142710. The cubic root of 51996 is about 37.3241544895.

The spelling of 51996 in words is "fifty-one thousand, nine hundred ninety-six".