645000319 has 8 divisors (see below), whose sum is σ = 654600960. Its totient is φ = 635435736.

The previous prime is 645000287. The next prime is 645000337. The reversal of 645000319 is 913000546.

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 645000319 - 2⁵ = 645000287 is a prime.

It is a super-2 number, since 2×645000319² = 832050823020203522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645000359) 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, 28152 + ... + 45634.

It is an arithmetic number, because the mean of its divisors is an integer number (81825120).

Almost surely, 2^645000319 is an apocalyptic number.

645000319 is a deficient number, since it is larger than the sum of its proper divisors (9600641).

645000319 is a wasteful number, since it uses less digits than its factorization.

645000319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18029.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 645000319 is about 25396.8564787062. The cubic root of 645000319 is about 864.0124022104.

The spelling of 645000319 in words is "six hundred forty-five million, three hundred nineteen", and thus it is an aban number.