645233200 has 60 divisors (see below), whose sum is σ = 1565322928. Its totient is φ = 255571200.

The previous prime is 645233177. The next prime is 645233201. The reversal of 645233200 is 2332546.

It is a happy number.

645233200 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 (25).

It is not an unprimeable number, because it can be changed into a prime (645233201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33370 + ... + 49030.

Almost surely, 2^645233200 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 645233200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (782661464).

645233200 is an abundant number, since it is smaller than the sum of its proper divisors (920089728).

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

645233200 is a wasteful number, since it uses less digits than its factorization.

645233200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15782 (or 15771 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 645233200 is about 25401.4409040117. The cubic root of 645233200 is about 864.1163752137.

Adding to 645233200 its reverse (2332546), we get a palindrome (647565746).

The spelling of 645233200 in words is "six hundred forty-five million, two hundred thirty-three thousand, two hundred".