51943680 has 216 divisors, whose sum is σ = 187492032. Its totient is φ = 13768704.

The previous prime is 51943673. The next prime is 51943681. The reversal of 51943680 is 8634915.

It is a tau number, because it is divible by the number of its divisors (216).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51943681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 310957 + ... + 311123.

Almost surely, 2^51943680 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 51943680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93746016).

51943680 is an abundant number, since it is smaller than the sum of its proper divisors (135548352).

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

51943680 is an equidigital number, since it uses as much as digits as its factorization.

51943680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 51943680 is about 7207.1964035955. The cubic root of 51943680 is about 373.1163137798.

The spelling of 51943680 in words is "fifty-one million, nine hundred forty-three thousand, six hundred eighty".