647742 has 16 divisors (see below), whose sum is σ = 1311120. Its totient is φ = 213312.

The previous prime is 647741. The next prime is 647743. The reversal of 647742 is 247746.

It is an interprime number because it is at equal distance from previous prime (647741) and next prime (647743).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647742.

It is not an unprimeable number, because it can be changed into a prime (647741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73 + ... + 1140.

It is an arithmetic number, because the mean of its divisors is an integer number (81945).

2⁶⁴⁷⁷⁴² is an apocalyptic number.

647742 is an abundant number, since it is smaller than the sum of its proper divisors (663378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647742 is a wasteful number, since it uses less digits than its factorization.

647742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307.

The product of its digits is 9408, while the sum is 30.

The square root of 647742 is about 804.8242044074. The cubic root of 647742 is about 86.5234881140.

The spelling of 647742 in words is "six hundred forty-seven thousand, seven hundred forty-two".