647379655 has 8 divisors (see below), whose sum is σ = 836613792. Its totient is φ = 478064928.

The previous prime is 647379637. The next prime is 647379751. The reversal of 647379655 is 556973746.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 647379655 - 2⁹ = 647379143 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 7 ways as a sum of consecutive naturals, for example, 4979779 + ... + 4979908.

It is an arithmetic number, because the mean of its divisors is an integer number (104576724).

Almost surely, 2^647379655 is an apocalyptic number.

647379655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

647379655 is a deficient number, since it is larger than the sum of its proper divisors (189234137).

647379655 is a wasteful number, since it uses less digits than its factorization.

647379655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9959705.

The product of its digits is 4762800, while the sum is 52.

The square root of 647379655 is about 25443.6564785803. The cubic root of 647379655 is about 865.0735144176.

The spelling of 647379655 in words is "six hundred forty-seven million, three hundred seventy-nine thousand, six hundred fifty-five".