647655189 has 8 divisors (see below), whose sum is σ = 863869632. Its totient is φ = 431605440.

The previous prime is 647655179. The next prime is 647655191. The reversal of 647655189 is 981556746.

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

It is not a de Polignac number, because 647655189 - 2⁷ = 647655061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647655149) 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, 31684 + ... + 47949.

It is an arithmetic number, because the mean of its divisors is an integer number (107983704).

Almost surely, 2^647655189 is an apocalyptic number.

It is an amenable number.

647655189 is a deficient number, since it is larger than the sum of its proper divisors (216214443).

647655189 is a wasteful number, since it uses less digits than its factorization.

647655189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82347.

The product of its digits is 1814400, while the sum is 51.

The square root of 647655189 is about 25449.0704938314. The cubic root of 647655189 is about 865.1962262121.

The spelling of 647655189 in words is "six hundred forty-seven million, six hundred fifty-five thousand, one hundred eighty-nine".