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51640 = 2351291
BaseRepresentation
bin1100100110111000
32121211121
430212320
53123030
61035024
7303361
oct144670
977747
1051640
1135886
1225a74
131a674
1414b68
151047a
hexc9b8

51640 has 16 divisors (see below), whose sum is σ = 116280. Its totient is φ = 20640.

The previous prime is 51637. The next prime is 51647. The reversal of 51640 is 4615.

51640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606 + ... + 685.

251640 is an apocalyptic number.

It is an amenable number.

51640 is an abundant number, since it is smaller than the sum of its proper divisors (64640).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58140).

51640 is a wasteful number, since it uses less digits than its factorization.

51640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302 (or 1298 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 51640 is about 227.2443618663. The cubic root of 51640 is about 37.2387771545.

It can be divided in two parts, 51 and 640, that multiplied together give a triangular number (32640 = T255).

The spelling of 51640 in words is "fifty-one thousand, six hundred forty".

Divisors: 1 2 4 5 8 10 20 40 1291 2582 5164 6455 10328 12910 25820 51640