647801 has 16 divisors (see below), whose sum is σ = 829440. Its totient is φ = 491280.

The previous prime is 647789. The next prime is 647809. The reversal of 647801 is 108746.

It is a cyclic number.

It is not a de Polignac number, because 647801 - 2¹⁸ = 385657 is a prime.

It is a super-2 number, since 2×647801² = 839292271202, which contains 22 as substring.

It is a Duffinian number.

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 647801.

It is not an unprimeable number, because it can be changed into a prime (647809) 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 15 ways as a sum of consecutive naturals, for example, 3530 + ... + 3708.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2⁶⁴⁷⁸⁰¹ is an apocalyptic number.

It is an amenable number.

647801 is a deficient number, since it is larger than the sum of its proper divisors (181639).

647801 is a wasteful number, since it uses less digits than its factorization.

647801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 647801 is about 804.8608575400. The cubic root of 647801 is about 86.5261150503.

The spelling of 647801 in words is "six hundred forty-seven thousand, eight hundred one".