647979545 has 8 divisors (see below), whose sum is σ = 780972360. Its totient is φ = 516119040.

The previous prime is 647979517. The next prime is 647979547. The reversal of 647979545 is 545979746.

647979545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 135047641 + 512931904 = 11621^2 + 22648^2 .

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

It is not a de Polignac number, because 647979545 - 2¹⁴ = 647963161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647979547) 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, 281816 + ... + 284105.

It is an arithmetic number, because the mean of its divisors is an integer number (97621545).

Almost surely, 2^647979545 is an apocalyptic number.

It is an amenable number.

647979545 is a deficient number, since it is larger than the sum of its proper divisors (132992815).

647979545 is a wasteful number, since it uses less digits than its factorization.

647979545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566155.

The product of its digits is 9525600, while the sum is 56.

The square root of 647979545 is about 25455.4423454003. The cubic root of 647979545 is about 865.3406367754.

The spelling of 647979545 in words is "six hundred forty-seven million, nine hundred seventy-nine thousand, five hundred forty-five".