647053685 has 4 divisors (see below), whose sum is σ = 776464428. Its totient is φ = 517642944.

The previous prime is 647053681. The next prime is 647053703. The reversal of 647053685 is 586350746.

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 72301009 + 574752676 = 8503^2 + 23974^2 .

It is a cyclic number.

It is not a de Polignac number, because 647053685 - 2² = 647053681 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647053681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64705364 + ... + 64705373.

It is an arithmetic number, because the mean of its divisors is an integer number (194116107).

Almost surely, 2^647053685 is an apocalyptic number.

It is an amenable number.

647053685 is a deficient number, since it is larger than the sum of its proper divisors (129410743).

647053685 is a wasteful number, since it uses less digits than its factorization.

647053685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129410742.

The product of its (nonzero) digits is 604800, while the sum is 44.

The square root of 647053685 is about 25437.2499496310. The cubic root of 647053685 is about 864.9282954807.

The spelling of 647053685 in words is "six hundred forty-seven million, fifty-three thousand, six hundred eighty-five".