51943920 has 160 divisors (see below), whose sum is σ = 188083200. Its totient is φ = 11854080.

The previous prime is 51943861. The next prime is 51943939. The reversal of 51943920 is 2934915.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82005 + ... + 82635.

It is an arithmetic number, because the mean of its divisors is an integer number (1175520).

Almost surely, 2^51943920 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 51943920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94041600).

51943920 is an abundant number, since it is smaller than the sum of its proper divisors (136139280).

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

51943920 is a wasteful number, since it uses less digits than its factorization.

51943920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668 (or 648 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 51943920 is about 7207.2130536012. The cubic root of 51943920 is about 373.1168884264.

The spelling of 51943920 in words is "fifty-one million, nine hundred forty-three thousand, nine hundred twenty".