645306152 has 8 divisors (see below), whose sum is σ = 1209949050. Its totient is φ = 322653072.

The previous prime is 645306127. The next prime is 645306157. The reversal of 645306152 is 251603546.

645306152 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 639381796 + 5924356 = 25286^2 + 2434^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (645306157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40331627 + ... + 40331642.

Almost surely, 2^645306152 is an apocalyptic number.

It is an amenable number.

645306152 is a deficient number, since it is larger than the sum of its proper divisors (564642898).

645306152 is a wasteful number, since it uses less digits than its factorization.

645306152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80663275 (or 80663271 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 645306152 is about 25402.8768449560. The cubic root of 645306152 is about 864.1489405157.

Adding to 645306152 its reverse (251603546), we get a palindrome (896909698).

The spelling of 645306152 in words is "six hundred forty-five million, three hundred six thousand, one hundred fifty-two".