51966320 has 80 divisors (see below), whose sum is σ = 140133888. Its totient is φ = 17552640.

The previous prime is 51966319. The next prime is 51966337. The reversal of 51966320 is 2366915.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39107 + ... + 40413.

Almost surely, 2^51966320 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 51966320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70066944).

51966320 is an abundant number, since it is smaller than the sum of its proper divisors (88167568).

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

51966320 is a wasteful number, since it uses less digits than its factorization.

51966320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398 (or 1392 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 51966320 is about 7208.7668848424. The cubic root of 51966320 is about 373.1705143188.

The spelling of 51966320 in words is "fifty-one million, nine hundred sixty-six thousand, three hundred twenty".