645147647 has 8 divisors (see below), whose sum is σ = 655645920. Its totient is φ = 634694400.

The previous prime is 645147611. The next prime is 645147653. The reversal of 645147647 is 746741546.

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 645147647 - 2²² = 640953343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645147598 and 645147607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645147667) 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, 18254 + ... + 40292.

It is an arithmetic number, because the mean of its divisors is an integer number (81955740).

Almost surely, 2^645147647 is an apocalyptic number.

645147647 is a deficient number, since it is larger than the sum of its proper divisors (10498273).

645147647 is a wasteful number, since it uses less digits than its factorization.

645147647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22513.

The product of its digits is 564480, while the sum is 44.

The square root of 645147647 is about 25399.7568295446. The cubic root of 645147647 is about 864.0781817791.

The spelling of 645147647 in words is "six hundred forty-five million, one hundred forty-seven thousand, six hundred forty-seven".