645763447 has 8 divisors (see below), whose sum is σ = 738174752. Its totient is φ = 553392000.

The previous prime is 645763403. The next prime is 645763453. The reversal of 645763447 is 744367546.

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

It is not a de Polignac number, because 645763447 - 2¹¹ = 645761399 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645763397 and 645763406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645763747) 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, 44947 + ... + 57547.

It is an arithmetic number, because the mean of its divisors is an integer number (92271844).

Almost surely, 2^645763447 is an apocalyptic number.

645763447 is a deficient number, since it is larger than the sum of its proper divisors (92411305).

645763447 is a wasteful number, since it uses less digits than its factorization.

645763447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19929.

The product of its digits is 1693440, while the sum is 46.

The square root of 645763447 is about 25411.8761015396. The cubic root of 645763447 is about 864.3530181614.

The spelling of 645763447 in words is "six hundred forty-five million, seven hundred sixty-three thousand, four hundred forty-seven".