6478661 has 4 divisors (see below), whose sum is σ = 7404192. Its totient is φ = 5553132.

The previous prime is 6478631. The next prime is 6478673. The reversal of 6478661 is 1668746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6478661 - 2¹⁰ = 6477637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6478631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462755 + ... + 462768.

It is an arithmetic number, because the mean of its divisors is an integer number (1851048).

Almost surely, 2^6478661 is an apocalyptic number.

It is an amenable number.

6478661 is a deficient number, since it is larger than the sum of its proper divisors (925531).

6478661 is an equidigital number, since it uses as much as digits as its factorization.

6478661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925530.

The product of its digits is 48384, while the sum is 38.

The square root of 6478661 is about 2545.3213942447. The cubic root of 6478661 is about 186.4211081630.

The spelling of 6478661 in words is "six million, four hundred seventy-eight thousand, six hundred sixty-one".