645495 has 16 divisors (see below), whose sum is σ = 1078272. Its totient is φ = 329120.

The previous prime is 645493. The next prime is 645497. The reversal of 645495 is 594546.

645495 = T₁₄₄ + T₁₄₅ + ... + T₁₈₉.

It is an interprime number because it is at equal distance from previous prime (645493) and next prime (645497).

It is not a de Polignac number, because 645495 - 2¹ = 645493 is a prime.

It is a d-powerful number, because it can be written as 6² + 4⁷ + 4⁷ + 5⁵ + 9⁶ + 5⁷ .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645495.

It is not an unprimeable number, because it can be changed into a prime (645493) 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 15 ways as a sum of consecutive naturals, for example, 591 + ... + 1280.

It is an arithmetic number, because the mean of its divisors is an integer number (67392).

2⁶⁴⁵⁴⁹⁵ is an apocalyptic number.

645495 is a deficient number, since it is larger than the sum of its proper divisors (432777).

645495 is a wasteful number, since it uses less digits than its factorization.

645495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1902.

The product of its digits is 21600, while the sum is 33.

The square root of 645495 is about 803.4270346460. The cubic root of 645495 is about 86.4233229646.

The spelling of 645495 in words is "six hundred forty-five thousand, four hundred ninety-five".