645228850 has 24 divisors (see below), whose sum is σ = 1371572928. Its totient is φ = 221221200.

The previous prime is 645228839. The next prime is 645228853. The reversal of 645228850 is 58822546.

645228850 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 (645228853) 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, 921406 + ... + 922105.

It is an arithmetic number, because the mean of its divisors is an integer number (57148872).

Almost surely, 2^645228850 is an apocalyptic number.

645228850 is an abundant number, since it is smaller than the sum of its proper divisors (726344078).

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

645228850 is a wasteful number, since it uses less digits than its factorization.

645228850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843530 (or 1843525 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 40.

The square root of 645228850 is about 25401.3552788035. The cubic root of 645228850 is about 864.1144333242.

The spelling of 645228850 in words is "six hundred forty-five million, two hundred twenty-eight thousand, eight hundred fifty".