647617447 has 4 divisors (see below), whose sum is σ = 650686936. Its totient is φ = 644547960.

The previous prime is 647617429. The next prime is 647617471. The reversal of 647617447 is 744716746.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744716746 = 2 ⋅372358373.

It is a cyclic number.

It is not a de Polignac number, because 647617447 - 2¹⁹ = 647093159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647617397 and 647617406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647612447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1534428 + ... + 1534849.

It is an arithmetic number, because the mean of its divisors is an integer number (162671734).

Almost surely, 2^647617447 is an apocalyptic number.

647617447 is a deficient number, since it is larger than the sum of its proper divisors (3069489).

647617447 is a wasteful number, since it uses less digits than its factorization.

647617447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3069488.

The product of its digits is 790272, while the sum is 46.

The square root of 647617447 is about 25448.3289628219. The cubic root of 647617447 is about 865.1794194962.

The spelling of 647617447 in words is "six hundred forty-seven million, six hundred seventeen thousand, four hundred forty-seven".