647653723 has 8 divisors (see below), whose sum is σ = 670284000. Its totient is φ = 625043328.

The previous prime is 647653697. The next prime is 647653729. The reversal of 647653723 is 327356746.

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 647653723 - 2⁹ = 647653211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647653723.

It is not an unprimeable number, because it can be changed into a prime (647653729) 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, 97203 + ... + 103651.

It is an arithmetic number, because the mean of its divisors is an integer number (83785500).

Almost surely, 2^647653723 is an apocalyptic number.

647653723 is a deficient number, since it is larger than the sum of its proper divisors (22630277).

647653723 is a wasteful number, since it uses less digits than its factorization.

647653723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9941.

The product of its digits is 635040, while the sum is 43.

The square root of 647653723 is about 25449.0416911914. The cubic root of 647653723 is about 865.1955734066.

The spelling of 647653723 in words is "six hundred forty-seven million, six hundred fifty-three thousand, seven hundred twenty-three".