647478 has 24 divisors (see below), whose sum is σ = 1511328. Its totient is φ = 199152.

The previous prime is 647477. The next prime is 647489. The reversal of 647478 is 874746.

It is a happy number.

647478 is a `hidden beast` number, since 647 + 4 + 7 + 8 = 666.

647478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

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 647478.

It is not an unprimeable number, because it can be changed into a prime (647477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1150 + ... + 1617.

It is an arithmetic number, because the mean of its divisors is an integer number (62972).

2⁶⁴⁷⁴⁷⁸ is an apocalyptic number.

647478 is an abundant number, since it is smaller than the sum of its proper divisors (863850).

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

647478 is a wasteful number, since it uses less digits than its factorization.

647478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2788 (or 2785 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 647478 is about 804.6601767206. The cubic root of 647478 is about 86.5117317332.

The spelling of 647478 in words is "six hundred forty-seven thousand, four hundred seventy-eight".