647481 has 4 divisors (see below), whose sum is σ = 863312. Its totient is φ = 431652.

The previous prime is 647477. The next prime is 647489. The reversal of 647481 is 184746.

647481 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 647481 - 2² = 647477 is a prime.

It is a super-3 number, since 3×647481³ = 814333574909956923, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647481.

It is not an unprimeable number, because it can be changed into a prime (647489) 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, 107911 + ... + 107916.

It is an arithmetic number, because the mean of its divisors is an integer number (215828).

2⁶⁴⁷⁴⁸¹ is an apocalyptic number.

It is an amenable number.

647481 is a deficient number, since it is larger than the sum of its proper divisors (215831).

647481 is a wasteful number, since it uses less digits than its factorization.

647481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215830.

The product of its digits is 5376, while the sum is 30.

The square root of 647481 is about 804.6620408594. The cubic root of 647481 is about 86.5118653464.

It can be divided in two parts, 6474 and 81, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 647481 in words is "six hundred forty-seven thousand, four hundred eighty-one".