647155 has 8 divisors (see below), whose sum is σ = 780912. Its totient is φ = 514848.

The previous prime is 647147. The next prime is 647161. The reversal of 647155 is 551746.

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 647155 - 2³ = 647147 is a prime.

It is a Duffinian 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, 1549 + ... + 1921.

It is an arithmetic number, because the mean of its divisors is an integer number (97614).

2⁶⁴⁷¹⁵⁵ is an apocalyptic number.

647155 is a deficient number, since it is larger than the sum of its proper divisors (133757).

647155 is a wasteful number, since it uses less digits than its factorization.

647155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725.

The product of its digits is 4200, while the sum is 28.

The square root of 647155 is about 804.4594458393. The cubic root of 647155 is about 86.4973436319.

The spelling of 647155 in words is "six hundred forty-seven thousand, one hundred fifty-five".