645435240 has 64 divisors (see below), whose sum is σ = 1939714560. Its totient is φ = 171813120.

The previous prime is 645435239. The next prime is 645435247. The reversal of 645435240 is 42534546.

645435240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (645435247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68410 + ... + 77270.

It is an arithmetic number, because the mean of its divisors is an integer number (30308040).

Almost surely, 2^645435240 is an apocalyptic number.

645435240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645435240 is an abundant number, since it is smaller than the sum of its proper divisors (1294279320).

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

645435240 is a wasteful number, since it uses less digits than its factorization.

645435240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9482 (or 9478 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 33.

The square root of 645435240 is about 25405.4175324870. The cubic root of 645435240 is about 864.2065585526.

Adding to 645435240 its reverse (42534546), we get a palindrome (687969786).

The spelling of 645435240 in words is "six hundred forty-five million, four hundred thirty-five thousand, two hundred forty".