645300 has 72 divisors (see below), whose sum is σ = 2083200. Its totient is φ = 171360.

The previous prime is 645257. The next prime is 645313. The reversal of 645300 is 3546.

It is a happy number.

645300 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2581 + ... + 2819.

2⁶⁴⁵³⁰⁰ is an apocalyptic number.

645300 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 645300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1041600).

645300 is an abundant number, since it is smaller than the sum of its proper divisors (1437900).

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

645300 is a wasteful number, since it uses less digits than its factorization.

645300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 645300 is about 803.3056703398. The cubic root of 645300 is about 86.4146194397.

Adding to 645300 its reverse (3546), we get a palindrome (648846).

The spelling of 645300 in words is "six hundred forty-five thousand, three hundred".