647545723 has 8 divisors (see below), whose sum is σ = 706641840. Its totient is φ = 588487680.

The previous prime is 647545667. The next prime is 647545739. The reversal of 647545723 is 327545746.

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

It is a de Polignac number, because none of the positive numbers 2^k-647545723 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 647545723.

It is not an unprimeable number, because it can be changed into a prime (647545753) 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, 35211 + ... + 50347.

It is an arithmetic number, because the mean of its divisors is an integer number (88330230).

Almost surely, 2^647545723 is an apocalyptic number.

647545723 is a deficient number, since it is larger than the sum of its proper divisors (59096117).

647545723 is a wasteful number, since it uses less digits than its factorization.

647545723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19037.

The product of its digits is 705600, while the sum is 43.

The square root of 647545723 is about 25446.9197153604. The cubic root of 647545723 is about 865.1474786130.

The spelling of 647545723 in words is "six hundred forty-seven million, five hundred forty-five thousand, seven hundred twenty-three".