647378297 has 4 divisors (see below), whose sum is σ = 650064756. Its totient is φ = 644691840.

The previous prime is 647378269. The next prime is 647378311. The reversal of 647378297 is 792873746.

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

It can be written as a sum of positive squares in 2 ways, for example, as 551122576 + 96255721 = 23476^2 + 9811^2 .

It is a cyclic number.

It is not a de Polignac number, because 647378297 - 2¹⁶ = 647312761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647378227) 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, 1342868 + ... + 1343349.

It is an arithmetic number, because the mean of its divisors is an integer number (162516189).

Almost surely, 2^647378297 is an apocalyptic number.

It is an amenable number.

647378297 is a deficient number, since it is larger than the sum of its proper divisors (2686459).

647378297 is a wasteful number, since it uses less digits than its factorization.

647378297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2686458.

The product of its digits is 3556224, while the sum is 53.

The square root of 647378297 is about 25443.6297921503. The cubic root of 647378297 is about 865.0729095326.

The spelling of 647378297 in words is "six hundred forty-seven million, three hundred seventy-eight thousand, two hundred ninety-seven".