645487 has 8 divisors (see below), whose sum is σ = 693360. Its totient is φ = 599040.

The previous prime is 645481. The next prime is 645493. The reversal of 645487 is 784546.

It is an interprime number because it is at equal distance from previous prime (645481) and next prime (645493).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645487 - 2¹¹ = 643439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645481) 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, 687 + ... + 1327.

It is an arithmetic number, because the mean of its divisors is an integer number (86670).

2⁶⁴⁵⁴⁸⁷ is an apocalyptic number.

645487 is a deficient number, since it is larger than the sum of its proper divisors (47873).

645487 is a wasteful number, since it uses less digits than its factorization.

645487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713.

The product of its digits is 26880, while the sum is 34.

The square root of 645487 is about 803.4220559581. The cubic root of 645487 is about 86.4229659314.

The spelling of 645487 in words is "six hundred forty-five thousand, four hundred eighty-seven".