645879207 has 8 divisors (see below), whose sum is σ = 867368320. Its totient is φ = 427488120.

The previous prime is 645879197. The next prime is 645879209. The reversal of 645879207 is 702978546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645879207 - 2¹¹ = 645877159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645879209) 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, 774019 + ... + 774852.

It is an arithmetic number, because the mean of its divisors is an integer number (108421040).

Almost surely, 2^645879207 is an apocalyptic number.

645879207 is a deficient number, since it is larger than the sum of its proper divisors (221489113).

645879207 is a wasteful number, since it uses less digits than its factorization.

645879207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549013.

The product of its (nonzero) digits is 846720, while the sum is 48.

The square root of 645879207 is about 25414.1536746751. The cubic root of 645879207 is about 864.4046632479.

The spelling of 645879207 in words is "six hundred forty-five million, eight hundred seventy-nine thousand, two hundred seven".