7644645647 has 8 divisors (see below), whose sum is σ = 7662968880. Its totient is φ = 7626343680.

The previous prime is 7644645643. The next prime is 7644645653. The reversal of 7644645647 is 7465464467.

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 7644645647 - 2² = 7644645643 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 (7644645643) 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, 883679 + ... + 892287.

It is an arithmetic number, because the mean of its divisors is an integer number (957871110).

Almost surely, 2^7644645647 is an apocalyptic number.

7644645647 is a deficient number, since it is larger than the sum of its proper divisors (18323233).

7644645647 is a wasteful number, since it uses less digits than its factorization.

7644645647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10633.

The product of its digits is 13547520, while the sum is 53.

The square root of 7644645647 is about 87433.6642661166. The cubic root of 7644645647 is about 1969.9375251387.

The spelling of 7644645647 in words is "seven billion, six hundred forty-four million, six hundred forty-five thousand, six hundred forty-seven".