647473 has 4 divisors (see below), whose sum is σ = 675648. Its totient is φ = 619300.

The previous prime is 647453. The next prime is 647477. The reversal of 647473 is 374746.

It is the 329-th star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 374746 = 2 ⋅187373.

It is a cyclic number.

It is not a de Polignac number, because 647473 - 2⁵ = 647441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647477) 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, 14053 + ... + 14098.

It is an arithmetic number, because the mean of its divisors is an integer number (168912).

2⁶⁴⁷⁴⁷³ is an apocalyptic number.

It is an amenable number.

647473 is a deficient number, since it is larger than the sum of its proper divisors (28175).

647473 is a wasteful number, since it uses less digits than its factorization.

647473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28174.

The product of its digits is 14112, while the sum is 31.

The square root of 647473 is about 804.6570698130. The cubic root of 647473 is about 86.5115090437.

The spelling of 647473 in words is "six hundred forty-seven thousand, four hundred seventy-three".