647711723 has 8 divisors (see below), whose sum is σ = 672080880. Its totient is φ = 623478240.

The previous prime is 647711719. The next prime is 647711761. The reversal of 647711723 is 327117746.

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 647711723 - 2² = 647711719 is a prime.

It is a super-2 number, since 2×647711723² = 839060952223257458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647711773) 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, 24140 + ... + 43337.

It is an arithmetic number, because the mean of its divisors is an integer number (84010110).

Almost surely, 2^647711723 is an apocalyptic number.

647711723 is a deficient number, since it is larger than the sum of its proper divisors (24369157).

647711723 is a wasteful number, since it uses less digits than its factorization.

647711723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67837.

The product of its digits is 49392, while the sum is 38.

The square root of 647711723 is about 25450.1811977832. The cubic root of 647711723 is about 865.2213998854.

The spelling of 647711723 in words is "six hundred forty-seven million, seven hundred eleven thousand, seven hundred twenty-three".