54640 has 20 divisors (see below), whose sum is σ = 127224. Its totient is φ = 21824.

The previous prime is 54631. The next prime is 54647. The reversal of 54640 is 4645.

54640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54647) 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, 262 + ... + 421.

2⁵⁴⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

54640 is an abundant number, since it is smaller than the sum of its proper divisors (72584).

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 (63612).

54640 is a wasteful number, since it uses less digits than its factorization.

54640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 54640 is about 233.7520053390. The cubic root of 54640 is about 37.9463694051.

The spelling of 54640 in words is "fifty-four thousand, six hundred forty".