645872579 has 8 divisors (see below), whose sum is σ = 705189360. Its totient is φ = 586656000.

The previous prime is 645872561. The next prime is 645872603. The reversal of 645872579 is 975278546.

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 645872579 - 2⁸ = 645872323 is a prime.

It is a super-2 number, since 2×645872579² = 834302776608222482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645872579.

It is not an unprimeable number, because it can be changed into a prime (645872509) 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, 11234 + ... + 37655.

It is an arithmetic number, because the mean of its divisors is an integer number (88148670).

Almost surely, 2^645872579 is an apocalyptic number.

645872579 is a deficient number, since it is larger than the sum of its proper divisors (59316781).

645872579 is a wasteful number, since it uses less digits than its factorization.

645872579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50101.

The product of its digits is 4233600, while the sum is 53.

The square root of 645872579 is about 25414.0232745624. The cubic root of 645872579 is about 864.4017064031.

The spelling of 645872579 in words is "six hundred forty-five million, eight hundred seventy-two thousand, five hundred seventy-nine".