5781649 has 8 divisors (see below), whose sum is σ = 6151680. Its totient is φ = 5414976.

The previous prime is 5781637. The next prime is 5781653. The reversal of 5781649 is 9461875.

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

It is not a de Polignac number, because 5781649 - 2¹⁵ = 5748881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5781689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3352 + ... + 4774.

It is an arithmetic number, because the mean of its divisors is an integer number (768960).

Almost surely, 2^5781649 is an apocalyptic number.

It is an amenable number.

5781649 is a deficient number, since it is larger than the sum of its proper divisors (370031).

5781649 is a wasteful number, since it uses less digits than its factorization.

5781649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679.

The product of its digits is 60480, while the sum is 40.

The square root of 5781649 is about 2404.5059783665. The cubic root of 5781649 is about 179.4804876331.

The spelling of 5781649 in words is "five million, seven hundred eighty-one thousand, six hundred forty-nine".