647090 has 8 divisors (see below), whose sum is σ = 1164780. Its totient is φ = 258832.

The previous prime is 647081. The next prime is 647099. The reversal of 647090 is 90746.

It is an interprime number because it is at equal distance from previous prime (647081) and next prime (647099).

It can be written as a sum of positive squares in 2 ways, for example, as 635209 + 11881 = 797^2 + 109^2 .

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

It is not an unprimeable number, because it can be changed into a prime (647099) by changing a digit.

647090 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32345 + ... + 32364.

2⁶⁴⁷⁰⁹⁰ is an apocalyptic number.

647090 is a deficient number, since it is larger than the sum of its proper divisors (517690).

647090 is a wasteful number, since it uses less digits than its factorization.

647090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64716.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 647090 is about 804.4190450257. The cubic root of 647090 is about 86.4944476149.

The spelling of 647090 in words is "six hundred forty-seven thousand, ninety".