647456 has 12 divisors (see below), whose sum is σ = 1274742. Its totient is φ = 323712.

The previous prime is 647453. The next prime is 647477. The reversal of 647456 is 654746.

It can be written as a sum of positive squares in only one way, i.e., 547600 + 99856 = 740^2 + 316^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 20233 = 647456 / (6 + 4 + 7 + 4 + 5 + 6).

It is not an unprimeable number, because it can be changed into a prime (647453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10085 + ... + 10148.

2⁶⁴⁷⁴⁵⁶ is an apocalyptic number.

It is an amenable number.

647456 is a deficient number, since it is larger than the sum of its proper divisors (627286).

647456 is a wasteful number, since it uses less digits than its factorization.

647456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20243 (or 20235 counting only the distinct ones).

The product of its digits is 20160, while the sum is 32.

The square root of 647456 is about 804.6465062374. The cubic root of 647456 is about 86.5107518906.

The spelling of 647456 in words is "six hundred forty-seven thousand, four hundred fifty-six".