545640 has 32 divisors (see below), whose sum is σ = 1637280. Its totient is φ = 145472.

The previous prime is 545621. The next prime is 545641. The reversal of 545640 is 46545.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 545640.

It is not an unprimeable number, because it can be changed into a prime (545641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2154 + ... + 2393.

It is an arithmetic number, because the mean of its divisors is an integer number (51165).

2⁵⁴⁵⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

545640 is an abundant number, since it is smaller than the sum of its proper divisors (1091640).

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

545640 is a wasteful number, since it uses less digits than its factorization.

545640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4561 (or 4557 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 545640 is about 738.6744885266. The cubic root of 545640 is about 81.7150530051.

The spelling of 545640 in words is "five hundred forty-five thousand, six hundred forty".