545680 has 40 divisors (see below), whose sum is σ = 1339200. Its totient is φ = 206208.

The previous prime is 545663. The next prime is 545711. The reversal of 545680 is 86545.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1341 + ... + 1699.

It is an arithmetic number, because the mean of its divisors is an integer number (33480).

2⁵⁴⁵⁶⁸⁰ 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 545680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (669600).

545680 is an abundant number, since it is smaller than the sum of its proper divisors (793520).

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

545680 is a wasteful number, since it uses less digits than its factorization.

545680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 545680 is about 738.7015635559. The cubic root of 545680 is about 81.7170497564.

It can be divided in two parts, 545 and 680, that added together give a triangular number (1225 = T₄₉).

The spelling of 545680 in words is "five hundred forty-five thousand, six hundred eighty".