645313277 has 8 divisors (see below), whose sum is σ = 769566336. Its totient is φ = 529076592.

The previous prime is 645313241. The next prime is 645313301. The reversal of 645313277 is 772313546.

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 645313277 - 2¹⁰ = 645312253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645313277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645313237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2003918 + ... + 2004239.

It is an arithmetic number, because the mean of its divisors is an integer number (96195792).

Almost surely, 2^645313277 is an apocalyptic number.

It is an amenable number.

645313277 is a deficient number, since it is larger than the sum of its proper divisors (124253059).

645313277 is a wasteful number, since it uses less digits than its factorization.

645313277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008187.

The product of its digits is 105840, while the sum is 38.

The square root of 645313277 is about 25403.0170845906. The cubic root of 645313277 is about 864.1521209382.

The spelling of 645313277 in words is "six hundred forty-five million, three hundred thirteen thousand, two hundred seventy-seven".