647426377 has 8 divisors (see below), whose sum is σ = 701261064. Its totient is φ = 594167808.

The previous prime is 647426369. The next prime is 647426389. The reversal of 647426377 is 773624746.

647426377 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 98883136 + 548543241 = 9944^2 + 23421^2 .

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

It is not a de Polignac number, because 647426377 - 2³ = 647426369 is a prime.

It is a super-3 number, since 3×647426377³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647426347) 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, 141688 + ... + 146185.

It is an arithmetic number, because the mean of its divisors is an integer number (87657633).

Almost surely, 2^647426377 is an apocalyptic number.

It is an amenable number.

647426377 is a deficient number, since it is larger than the sum of its proper divisors (53834687).

647426377 is a wasteful number, since it uses less digits than its factorization.

647426377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288059.

The product of its digits is 1185408, while the sum is 46.

The square root of 647426377 is about 25444.5746083522. The cubic root of 647426377 is about 865.0943249740.

The spelling of 647426377 in words is "six hundred forty-seven million, four hundred twenty-six thousand, three hundred seventy-seven".