645666282 has 32 divisors (see below), whose sum is σ = 1435656000. Its totient is φ = 215095824.

The previous prime is 645666271. The next prime is 645666283. The reversal of 645666282 is 282666546.

It is a super-3 number, since 3×645666282³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (645666283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155469 + ... + 159567.

It is an arithmetic number, because the mean of its divisors is an integer number (44864250).

Almost surely, 2^645666282 is an apocalyptic number.

645666282 is an abundant number, since it is smaller than the sum of its proper divisors (789989718).

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

645666282 is a wasteful number, since it uses less digits than its factorization.

645666282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7027 (or 7021 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 645666282 is about 25409.9642266572. The cubic root of 645666282 is about 864.3096642707.

The spelling of 645666282 in words is "six hundred forty-five million, six hundred sixty-six thousand, two hundred eighty-two".