645277307 has 8 divisors (see below), whose sum is σ = 681584640. Its totient is φ = 609938280.

The previous prime is 645277301. The next prime is 645277309. The reversal of 645277307 is 703772546.

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 645277307 - 2⁴ = 645277291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645277301) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 240707 + ... + 243372.

It is an arithmetic number, because the mean of its divisors is an integer number (85198080).

Almost surely, 2^645277307 is an apocalyptic number.

645277307 is a deficient number, since it is larger than the sum of its proper divisors (36307333).

645277307 is a wasteful number, since it uses less digits than its factorization.

645277307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484153.

The product of its (nonzero) digits is 246960, while the sum is 41.

The square root of 645277307 is about 25402.3090879550. The cubic root of 645277307 is about 864.1360645872.

The spelling of 645277307 in words is "six hundred forty-five million, two hundred seventy-seven thousand, three hundred seven".