645426105 has 32 divisors (see below), whose sum is σ = 1089037440. Its totient is φ = 325509120.

The previous prime is 645426091. The next prime is 645426203. The reversal of 645426105 is 501624546.

It is not a de Polignac number, because 645426105 - 2⁵ = 645426073 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 180919 + ... + 184451.

It is an arithmetic number, because the mean of its divisors is an integer number (34032420).

Almost surely, 2^645426105 is an apocalyptic number.

It is an amenable number.

645426105 is a deficient number, since it is larger than the sum of its proper divisors (443611335).

645426105 is a wasteful number, since it uses less digits than its factorization.

645426105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4201.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 645426105 is about 25405.2377473623. The cubic root of 645426105 is about 864.2024814257.

The spelling of 645426105 in words is "six hundred forty-five million, four hundred twenty-six thousand, one hundred five".