647674693 has 2 divisors, whose sum is σ = 647674694. Its totient is φ = 647674692.

The previous prime is 647674673. The next prime is 647674747. The reversal of 647674693 is 396476746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 544895649 + 102779044 = 23343^2 + 10138^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647674693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647674693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647674613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323837346 + 323837347.

It is an arithmetic number, because the mean of its divisors is an integer number (323837347).

Almost surely, 2^647674693 is an apocalyptic number.

It is an amenable number.

647674693 is a deficient number, since it is larger than the sum of its proper divisors (1).

647674693 is an equidigital number, since it uses as much as digits as its factorization.

647674693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 52.

The square root of 647674693 is about 25449.4536876531. The cubic root of 647674693 is about 865.2049111925.

The spelling of 647674693 in words is "six hundred forty-seven million, six hundred seventy-four thousand, six hundred ninety-three".