645853912 has 16 divisors (see below), whose sum is σ = 1321065000. Its totient is φ = 293569920.

The previous prime is 645853889. The next prime is 645853921. The reversal of 645853912 is 219358546.

It is a super-3 number, since 3×645853912³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3669537 + ... + 3669712.

Almost surely, 2^645853912 is an apocalyptic number.

It is an amenable number.

645853912 is an abundant number, since it is smaller than the sum of its proper divisors (675211088).

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

645853912 is a wasteful number, since it uses less digits than its factorization.

645853912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7339266 (or 7339262 counting only the distinct ones).

The product of its digits is 259200, while the sum is 43.

The square root of 645853912 is about 25413.6560140410. The cubic root of 645853912 is about 864.3933786810.

The spelling of 645853912 in words is "six hundred forty-five million, eight hundred fifty-three thousand, nine hundred twelve".