645150 has 96 divisors (see below), whose sum is σ = 1928448. Its totient is φ = 140800.

The previous prime is 645149. The next prime is 645179. The reversal of 645150 is 51546.

It is a happy number.

645150 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28039 + ... + 28061.

It is an arithmetic number, because the mean of its divisors is an integer number (20088).

2⁶⁴⁵¹⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (964224).

645150 is an abundant number, since it is smaller than the sum of its proper divisors (1283298).

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

645150 is a wasteful number, since it uses less digits than its factorization.

645150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 645150 is about 803.2123007026. The cubic root of 645150 is about 86.4079232274.

Adding to 645150 its reverse (51546), we get a palindrome (696696).

The spelling of 645150 in words is "six hundred forty-five thousand, one hundred fifty".