645480 has 96 divisors (see below), whose sum is σ = 2302560. Its totient is φ = 155520.

The previous prime is 645467. The next prime is 645481. The reversal of 645480 is 84546.

645480 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645480.

It is not an unprimeable number, because it can be changed into a prime (645481) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3879 + ... + 4041.

It is an arithmetic number, because the mean of its divisors is an integer number (23985).

2⁶⁴⁵⁴⁸⁰ is an apocalyptic number.

645480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1151280).

645480 is an abundant number, since it is smaller than the sum of its proper divisors (1657080).

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

645480 is a wasteful number, since it uses less digits than its factorization.

645480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 645480 is about 803.4176995810. The cubic root of 645480 is about 86.4226535249.

The spelling of 645480 in words is "six hundred forty-five thousand, four hundred eighty".