645433106 has 16 divisors (see below), whose sum is σ = 1028606040. Its totient is φ = 303166080.

The previous prime is 645433091. The next prime is 645433163. The reversal of 645433106 is 601334546.

It can be written as a sum of positive squares in 4 ways, for example, as 607178881 + 38254225 = 24641^2 + 6185^2 .

It is an unprimeable number.

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, 148235 + ... + 152526.

Almost surely, 2^645433106 is an apocalyptic number.

645433106 is a deficient number, since it is larger than the sum of its proper divisors (383172934).

645433106 is a wasteful number, since it uses less digits than its factorization.

645433106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300829.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 645433106 is about 25405.3755335362. The cubic root of 645433106 is about 864.2056061106.

The spelling of 645433106 in words is "six hundred forty-five million, four hundred thirty-three thousand, one hundred six".