645286280 has 32 divisors (see below), whose sum is σ = 1457438400. Its totient is φ = 257128896.

The previous prime is 645286267. The next prime is 645286283. The reversal of 645286280 is 82682546.

It is not an unprimeable number, because it can be changed into a prime (645286283) 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 7 ways as a sum of consecutive naturals, for example, 20150 + ... + 41189.

It is an arithmetic number, because the mean of its divisors is an integer number (45544950).

Almost surely, 2^645286280 is an apocalyptic number.

It is an amenable number.

645286280 is an abundant number, since it is smaller than the sum of its proper divisors (812152120).

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

645286280 is a wasteful number, since it uses less digits than its factorization.

645286280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61613 (or 61609 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 41.

The square root of 645286280 is about 25402.4857051431. The cubic root of 645286280 is about 864.1400700264.

The spelling of 645286280 in words is "six hundred forty-five million, two hundred eighty-six thousand, two hundred eighty".