645890082 has 16 divisors (see below), whose sum is σ = 1312957632. Its totient is φ = 211767120.

The previous prime is 645890039. The next prime is 645890083. The reversal of 645890082 is 280098546.

It is not an unprimeable number, because it can be changed into a prime (645890083) 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, 881998 + ... + 882729.

It is an arithmetic number, because the mean of its divisors is an integer number (82059852).

Almost surely, 2^645890082 is an apocalyptic number.

645890082 is an abundant number, since it is smaller than the sum of its proper divisors (667067550).

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

645890082 is a wasteful number, since it uses less digits than its factorization.

645890082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764793.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 645890082 is about 25414.3676293549. The cubic root of 645890082 is about 864.4095146958.

The spelling of 645890082 in words is "six hundred forty-five million, eight hundred ninety thousand, eighty-two".