647672005 has 8 divisors (see below), whose sum is σ = 784337400. Its totient is φ = 513383616.

The previous prime is 647671979. The next prime is 647672009. The reversal of 647672005 is 500276746.

It can be written as a sum of positive squares in 4 ways, for example, as 333354564 + 314317441 = 18258^2 + 17729^2 .

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 647672005 - 2²³ = 639283397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647672009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 593650 + ... + 594739.

It is an arithmetic number, because the mean of its divisors is an integer number (98042175).

Almost surely, 2^647672005 is an apocalyptic number.

It is an amenable number.

647672005 is a deficient number, since it is larger than the sum of its proper divisors (136665395).

647672005 is a wasteful number, since it uses less digits than its factorization.

647672005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188503.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 647672005 is about 25449.4008770344. The cubic root of 647672005 is about 865.2037142572.

The spelling of 647672005 in words is "six hundred forty-seven million, six hundred seventy-two thousand, five".