645935285 has 8 divisors (see below), whose sum is σ = 777320280. Its totient is φ = 515282944.

The previous prime is 645935273. The next prime is 645935321. The reversal of 645935285 is 582539546.

It can be written as a sum of positive squares in 4 ways, for example, as 76492516 + 569442769 = 8746^2 + 23863^2 .

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 645935285 - 2⁸ = 645935029 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181220 + ... + 184749.

It is an arithmetic number, because the mean of its divisors is an integer number (97165035).

Almost surely, 2^645935285 is an apocalyptic number.

It is an amenable number.

645935285 is a deficient number, since it is larger than the sum of its proper divisors (131384995).

645935285 is a wasteful number, since it uses less digits than its factorization.

645935285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366327.

The product of its digits is 1296000, while the sum is 47.

The square root of 645935285 is about 25415.2569335822. The cubic root of 645935285 is about 864.4296796293.

The spelling of 645935285 in words is "six hundred forty-five million, nine hundred thirty-five thousand, two hundred eighty-five".