51643860 has 96 divisors (see below), whose sum is σ = 152245632. Its totient is φ = 13063680.

The previous prime is 51643859. The next prime is 51643877. The reversal of 51643860 is 6834615.

It is a super-3 number, since 3×51643860³ (a number of 24 digits) contains 333 as substring.

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, 95190 + ... + 95730.

It is an arithmetic number, because the mean of its divisors is an integer number (1585892).

Almost surely, 2^51643860 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 51643860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76122816).

51643860 is an abundant number, since it is smaller than the sum of its proper divisors (100601772).

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

51643860 is a wasteful number, since it uses less digits than its factorization.

51643860 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 (nonzero) digits is 17280, while the sum is 33.

The square root of 51643860 is about 7186.3662584090. The cubic root of 51643860 is about 372.3970497593.

The spelling of 51643860 in words is "fifty-one million, six hundred forty-three thousand, eight hundred sixty".