647078 has 8 divisors (see below), whose sum is σ = 975240. Its totient is φ = 322000.

The previous prime is 647069. The next prime is 647081. The reversal of 647078 is 870746.

Added to its reverse (870746) it gives a square (1517824 = 1232²).

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

It is a congruent number.

It is an unprimeable number.

647078 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, 143 + ... + 1146.

It is an arithmetic number, because the mean of its divisors is an integer number (121905).

2⁶⁴⁷⁰⁷⁸ is an apocalyptic number.

647078 is a deficient number, since it is larger than the sum of its proper divisors (328162).

647078 is a wasteful number, since it uses less digits than its factorization.

647078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 647078 is about 804.4115861920. The cubic root of 647078 is about 86.4939129444.

Adding to 647078 its reverse (870746), we get a square (1517824 = 1232²).

The spelling of 647078 in words is "six hundred forty-seven thousand, seventy-eight".