645085106 has 16 divisors (see below), whose sum is σ = 1001721600. Its totient is φ = 311194128.

The previous prime is 645085087. The next prime is 645085109. The reversal of 645085106 is 601580546.

It is a happy number.

It is a super-2 number, since 2×645085106² = 832269587966062472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645085109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98861 + ... + 105183.

It is an arithmetic number, because the mean of its divisors is an integer number (62607600).

Almost surely, 2^645085106 is an apocalyptic number.

645085106 is a deficient number, since it is larger than the sum of its proper divisors (356636494).

645085106 is a wasteful number, since it uses less digits than its factorization.

645085106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8113.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 645085106 is about 25398.5256658728. The cubic root of 645085106 is about 864.0502594577.

The spelling of 645085106 in words is "six hundred forty-five million, eighty-five thousand, one hundred six".