51943720 has 64 divisors (see below), whose sum is σ = 126100800. Its totient is φ = 19192320.

The previous prime is 51943711. The next prime is 51943733. The reversal of 51943720 is 2734915.

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, 30327 + ... + 31993.

It is an arithmetic number, because the mean of its divisors is an integer number (1970325).

Almost surely, 2^51943720 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 51943720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63050400).

51943720 is an abundant number, since it is smaller than the sum of its proper divisors (74157080).

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

51943720 is a wasteful number, since it uses less digits than its factorization.

51943720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1738 (or 1734 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 51943720 is about 7207.1991785991. The cubic root of 51943720 is about 373.1164095543.

The spelling of 51943720 in words is "fifty-one million, nine hundred forty-three thousand, seven hundred twenty".