645308319 has 8 divisors (see below), whose sum is σ = 890080560. Its totient is φ = 415370816.

The previous prime is 645308303. The next prime is 645308327. The reversal of 645308319 is 913803546.

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 645308319 - 2⁴ = 645308303 is a prime.

It is a super-2 number, since 2×645308319² = 832845653141211522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645308359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3708582 + ... + 3708755.

It is an arithmetic number, because the mean of its divisors is an integer number (111260070).

Almost surely, 2^645308319 is an apocalyptic number.

645308319 is a deficient number, since it is larger than the sum of its proper divisors (244772241).

645308319 is a wasteful number, since it uses less digits than its factorization.

645308319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7417369.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 645308319 is about 25402.9194975696. The cubic root of 645308319 is about 864.1499078130.

The spelling of 645308319 in words is "six hundred forty-five million, three hundred eight thousand, three hundred nineteen".