647340655 has 32 divisors (see below), whose sum is σ = 856062144. Its totient is φ = 467030016.

The previous prime is 647340649. The next prime is 647340703. The reversal of 647340655 is 556043746.

It is a cyclic number.

It is not a de Polignac number, because 647340655 - 2⁵ = 647340623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 522697 + ... + 523933.

It is an arithmetic number, because the mean of its divisors is an integer number (26751942).

Almost surely, 2^647340655 is an apocalyptic number.

647340655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

647340655 is a deficient number, since it is larger than the sum of its proper divisors (208721489).

647340655 is a wasteful number, since it uses less digits than its factorization.

647340655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435.

The product of its (nonzero) digits is 302400, while the sum is 40.

The square root of 647340655 is about 25442.8900677576. The cubic root of 647340655 is about 865.0561425687.

The spelling of 647340655 in words is "six hundred forty-seven million, three hundred forty thousand, six hundred fifty-five".