647647653 has 8 divisors (see below), whose sum is σ = 872080416. Its totient is φ = 427490000.

The previous prime is 647647643. The next prime is 647647687. The reversal of 647647653 is 356746746.

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 647647653 - 2⁸ = 647647397 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647647643) 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, 1068423 + ... + 1069028.

It is an arithmetic number, because the mean of its divisors is an integer number (109010052).

Almost surely, 2^647647653 is an apocalyptic number.

It is an amenable number.

647647653 is a deficient number, since it is larger than the sum of its proper divisors (224432763).

647647653 is a wasteful number, since it uses less digits than its factorization.

647647653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137555.

The product of its digits is 2540160, while the sum is 48.

The square root of 647647653 is about 25448.9224329833. The cubic root of 647647653 is about 865.1928704429.

The spelling of 647647653 in words is "six hundred forty-seven million, six hundred forty-seven thousand, six hundred fifty-three".