647712371 has 4 divisors (see below), whose sum is σ = 647918544. Its totient is φ = 647506200.

The previous prime is 647712353. The next prime is 647712379. The reversal of 647712371 is 173217746.

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

It is a cyclic number.

It is not a de Polignac number, because 647712371 - 2¹⁰ = 647711347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647712379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98300 + ... + 104681.

It is an arithmetic number, because the mean of its divisors is an integer number (161979636).

Almost surely, 2^647712371 is an apocalyptic number.

647712371 is a deficient number, since it is larger than the sum of its proper divisors (206173).

647712371 is a wasteful number, since it uses less digits than its factorization.

647712371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206172.

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

The square root of 647712371 is about 25450.1939285342. The cubic root of 647712371 is about 865.2216884208.

The spelling of 647712371 in words is "six hundred forty-seven million, seven hundred twelve thousand, three hundred seventy-one".