647278 has 8 divisors (see below), whose sum is σ = 997272. Its totient is φ = 314856.

The previous prime is 647263. The next prime is 647293. The reversal of 647278 is 872746.

647278 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (647263) and next prime (647293).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4300 + ... + 4447.

It is an arithmetic number, because the mean of its divisors is an integer number (124659).

2⁶⁴⁷²⁷⁸ is an apocalyptic number.

647278 is a deficient number, since it is larger than the sum of its proper divisors (349994).

647278 is a wasteful number, since it uses less digits than its factorization.

647278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8786.

The product of its digits is 18816, while the sum is 34.

The square root of 647278 is about 804.5358910577. The cubic root of 647278 is about 86.5028232564.

The spelling of 647278 in words is "six hundred forty-seven thousand, two hundred seventy-eight".