647670055 has 4 divisors (see below), whose sum is σ = 777204072. Its totient is φ = 518136040.

The previous prime is 647670053. The next prime is 647670061. The reversal of 647670055 is 550076746.

It is a happy number.

647670055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 647670055 - 2¹ = 647670053 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 (647670053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64767001 + ... + 64767010.

It is an arithmetic number, because the mean of its divisors is an integer number (194301018).

Almost surely, 2^647670055 is an apocalyptic number.

647670055 is a deficient number, since it is larger than the sum of its proper divisors (129534017).

647670055 is a wasteful number, since it uses less digits than its factorization.

647670055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129534016.

The product of its (nonzero) digits is 176400, while the sum is 40.

The square root of 647670055 is about 25449.3625656911. The cubic root of 647670055 is about 865.2028459428.

The spelling of 647670055 in words is "six hundred forty-seven million, six hundred seventy thousand, fifty-five".