645902752 has 48 divisors (see below), whose sum is σ = 1392697152. Its totient is φ = 292433920.

The previous prime is 645902729. The next prime is 645902753. The reversal of 645902752 is 257209546.

It is not an unprimeable number, because it can be changed into a prime (645902753) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89088 + ... + 96064.

It is an arithmetic number, because the mean of its divisors is an integer number (29014524).

Almost surely, 2^645902752 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 645902752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (696348576).

645902752 is an abundant number, since it is smaller than the sum of its proper divisors (746794400).

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

645902752 is a wasteful number, since it uses less digits than its factorization.

645902752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7261 (or 7253 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 645902752 is about 25414.6168965814. The cubic root of 645902752 is about 864.4151668427.

The spelling of 645902752 in words is "six hundred forty-five million, nine hundred two thousand, seven hundred fifty-two".