6440488 has 8 divisors (see below), whose sum is σ = 12075930. Its totient is φ = 3220240.

The previous prime is 6440477. The next prime is 6440491. The reversal of 6440488 is 8840446.

It can be written as a sum of positive squares in only one way, i.e., 4418404 + 2022084 = 2102^2 + 1422^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402523 + ... + 402538.

Almost surely, 2^6440488 is an apocalyptic number.

It is an amenable number.

6440488 is a deficient number, since it is larger than the sum of its proper divisors (5635442).

6440488 is a wasteful number, since it uses less digits than its factorization.

6440488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805067 (or 805063 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 6440488 is about 2537.8116557381. The cubic root of 6440488 is about 186.0542486385.

The spelling of 6440488 in words is "six million, four hundred forty thousand, four hundred eighty-eight".