647542 has 16 divisors (see below), whose sum is σ = 1158912. Its totient is φ = 265320.

The previous prime is 647531. The next prime is 647551. The reversal of 647542 is 245746.

It is a self number, because there is not a number n which added to its sum of digits gives 647542.

It is a congruent number.

It is an unprimeable number.

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, 684 + ... + 1327.

It is an arithmetic number, because the mean of its divisors is an integer number (72432).

2⁶⁴⁷⁵⁴² is an apocalyptic number.

647542 is a deficient number, since it is larger than the sum of its proper divisors (511370).

647542 is a wasteful number, since it uses less digits than its factorization.

647542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043.

The product of its digits is 6720, while the sum is 28.

The square root of 647542 is about 804.6999440785. The cubic root of 647542 is about 86.5145820583.

The spelling of 647542 in words is "six hundred forty-seven thousand, five hundred forty-two".