6478491 has 4 divisors (see below), whose sum is σ = 8637992. Its totient is φ = 4318992.

The previous prime is 6478489. The next prime is 6478499. The reversal of 6478491 is 1948746.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6478491 - 2¹ = 6478489 is a prime.

It is a D-number.

It is a Duffinian number.

6478491 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6478499) by changing a digit.

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, 1079746 + ... + 1079751.

It is an arithmetic number, because the mean of its divisors is an integer number (2159498).

Almost surely, 2^6478491 is an apocalyptic number.

6478491 is a deficient number, since it is larger than the sum of its proper divisors (2159501).

6478491 is a wasteful number, since it uses less digits than its factorization.

6478491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159500.

The product of its digits is 48384, while the sum is 39.

The square root of 6478491 is about 2545.2879994217. The cubic root of 6478491 is about 186.4194775861.

The spelling of 6478491 in words is "six million, four hundred seventy-eight thousand, four hundred ninety-one".