647634773 has 2 divisors, whose sum is σ = 647634774. Its totient is φ = 647634772.

The previous prime is 647634751. The next prime is 647634809. The reversal of 647634773 is 377436746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 530519089 + 117115684 = 23033^2 + 10822^2 .

It is a cyclic number.

It is not a de Polignac number, because 647634773 - 2¹⁸ = 647372629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647631773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323817386 + 323817387.

It is an arithmetic number, because the mean of its divisors is an integer number (323817387).

Almost surely, 2^647634773 is an apocalyptic number.

It is an amenable number.

647634773 is a deficient number, since it is larger than the sum of its proper divisors (1).

647634773 is an equidigital number, since it uses as much as digits as its factorization.

647634773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 47.

The square root of 647634773 is about 25448.6693758240. The cubic root of 647634773 is about 865.1871349384.

The spelling of 647634773 in words is "six hundred forty-seven million, six hundred thirty-four thousand, seven hundred seventy-three".