647827 has 4 divisors (see below), whose sum is σ = 653056. Its totient is φ = 642600.

The previous prime is 647821. The next prime is 647837. The reversal of 647827 is 728746.

647827 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 728746 = 2 ⋅364373.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647827 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647792 and 647801.

It is not an unprimeable number, because it can be changed into a prime (647821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2424 + ... + 2677.

It is an arithmetic number, because the mean of its divisors is an integer number (163264).

2⁶⁴⁷⁸²⁷ is an apocalyptic number.

647827 is a deficient number, since it is larger than the sum of its proper divisors (5229).

647827 is a wasteful number, since it uses less digits than its factorization.

647827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5228.

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

The square root of 647827 is about 804.8770092381. The cubic root of 647827 is about 86.5272726325.

The spelling of 647827 in words is "six hundred forty-seven thousand, eight hundred twenty-seven".