647098671 has 4 divisors (see below), whose sum is σ = 862798232. Its totient is φ = 431399112.

The previous prime is 647098667. The next prime is 647098687. The reversal of 647098671 is 176890746.

647098671 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 647098671 - 2² = 647098667 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 647098671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647098601) 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, 107849776 + ... + 107849781.

It is an arithmetic number, because the mean of its divisors is an integer number (215699558).

Almost surely, 2^647098671 is an apocalyptic number.

647098671 is a deficient number, since it is larger than the sum of its proper divisors (215699561).

647098671 is a wasteful number, since it uses less digits than its factorization.

647098671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215699560.

The product of its (nonzero) digits is 508032, while the sum is 48.

The square root of 647098671 is about 25438.1341886546. The cubic root of 647098671 is about 864.9483395479.

The spelling of 647098671 in words is "six hundred forty-seven million, ninety-eight thousand, six hundred seventy-one".