647771255 has 8 divisors (see below), whose sum is σ = 777871392. Its totient is φ = 517853088.

The previous prime is 647771239. The next prime is 647771273. The reversal of 647771255 is 552177746.

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 647771255 - 2⁴ = 647771239 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, 37532 + ... + 52001.

It is an arithmetic number, because the mean of its divisors is an integer number (97233924).

Almost surely, 2^647771255 is an apocalyptic number.

647771255 is a deficient number, since it is larger than the sum of its proper divisors (130100137).

647771255 is a wasteful number, since it uses less digits than its factorization.

647771255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90985.

The product of its digits is 411600, while the sum is 44.

The square root of 647771255 is about 25451.3507500093. The cubic root of 647771255 is about 865.2479069360.

The spelling of 647771255 in words is "six hundred forty-seven million, seven hundred seventy-one thousand, two hundred fifty-five".