645834441 has 8 divisors (see below), whose sum is σ = 984128704. Its totient is φ = 369048240.

The previous prime is 645834421. The next prime is 645834443. The reversal of 645834441 is 144438546.

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

It is not a de Polignac number, because 645834441 - 2¹⁷ = 645703369 is a prime.

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 645834441.

It is not an unprimeable number, because it can be changed into a prime (645834443) 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, 15376990 + ... + 15377031.

It is an arithmetic number, because the mean of its divisors is an integer number (123016088).

Almost surely, 2^645834441 is an apocalyptic number.

It is an amenable number.

645834441 is a deficient number, since it is larger than the sum of its proper divisors (338294263).

645834441 is a wasteful number, since it uses less digits than its factorization.

645834441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30754031.

The product of its digits is 184320, while the sum is 39.

The square root of 645834441 is about 25413.2729297114. The cubic root of 645834441 is about 864.3846921074.

The spelling of 645834441 in words is "six hundred forty-five million, eight hundred thirty-four thousand, four hundred forty-one".