5649781 has 8 divisors (see below), whose sum is σ = 5932800. Its totient is φ = 5373120.

The previous prime is 5649779. The next prime is 5649793. The reversal of 5649781 is 1879465.

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

It is a cyclic number.

It is not a de Polignac number, because 5649781 - 2¹ = 5649779 is a prime.

It is a super-2 number, since 2×5649781² = 63840050695922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5649701) 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 7 ways as a sum of consecutive naturals, for example, 285 + ... + 3373.

It is an arithmetic number, because the mean of its divisors is an integer number (741600).

Almost surely, 2^5649781 is an apocalyptic number.

It is an amenable number.

5649781 is a deficient number, since it is larger than the sum of its proper divisors (283019).

5649781 is a wasteful number, since it uses less digits than its factorization.

5649781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3179.

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

The square root of 5649781 is about 2376.9267973583. The cubic root of 5649781 is about 178.1054481874.

The spelling of 5649781 in words is "five million, six hundred forty-nine thousand, seven hundred eighty-one".