645468372 has 48 divisors (see below), whose sum is σ = 1680448000. Its totient is φ = 214254720.

The previous prime is 645468353. The next prime is 645468377. The reversal of 645468372 is 273864546.

It is a super-3 number, since 3×645468372³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645468377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13629 + ... + 38427.

Almost surely, 2^645468372 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 645468372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (840224000).

645468372 is an abundant number, since it is smaller than the sum of its proper divisors (1034979628).

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

645468372 is a wasteful number, since it uses less digits than its factorization.

645468372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25053 (or 25045 counting only the distinct ones).

The product of its digits is 967680, while the sum is 45.

The square root of 645468372 is about 25406.0695897654. The cubic root of 645468372 is about 864.2213456812.

The spelling of 645468372 in words is "six hundred forty-five million, four hundred sixty-eight thousand, three hundred seventy-two".