6440920 has 32 divisors (see below), whose sum is σ = 15124320. Its totient is φ = 2464000.

The previous prime is 6440893. The next prime is 6440933. The reversal of 6440920 is 290446.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2581 + ... + 4420.

It is an arithmetic number, because the mean of its divisors is an integer number (472635).

Almost surely, 2^6440920 is an apocalyptic number.

It is an amenable number.

6440920 is an abundant number, since it is smaller than the sum of its proper divisors (8683400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6440920 is a wasteful number, since it uses less digits than its factorization.

6440920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7035 (or 7031 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 6440920 is about 2537.8967670100. The cubic root of 6440920 is about 186.0584084495.

The spelling of 6440920 in words is "six million, four hundred forty thousand, nine hundred twenty".