645452304 has 120 divisors (see below), whose sum is σ = 2006746560. Its totient is φ = 178036992.

The previous prime is 645452303. The next prime is 645452323. The reversal of 645452304 is 403254546.

It is not an unprimeable number, because it can be changed into a prime (645452303) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63477 + ... + 72939.

It is an arithmetic number, because the mean of its divisors is an integer number (16722888).

Almost surely, 2^645452304 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 645452304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1003373280).

645452304 is an abundant number, since it is smaller than the sum of its proper divisors (1361294256).

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

645452304 is a wasteful number, since it uses less digits than its factorization.

645452304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9517 (or 9504 counting only the distinct ones).

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

The square root of 645452304 is about 25405.7533641496. The cubic root of 645452304 is about 864.2141744423.

The spelling of 645452304 in words is "six hundred forty-five million, four hundred fifty-two thousand, three hundred four".