6490440 has 144 divisors (see below), whose sum is σ = 23341500. Its totient is φ = 1562880.

The previous prime is 6490427. The next prime is 6490483. The reversal of 6490440 is 440946.

It can be written as a sum of positive squares in 2 ways, for example, as 5963364 + 527076 = 2442^2 + 726^2 .

It is a super-2 number, since 2×6490440² = 84251622787200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 43486 + ... + 43634.

Almost surely, 2^6490440 is an apocalyptic number.

6490440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6490440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11670750).

6490440 is an abundant number, since it is smaller than the sum of its proper divisors (16851060).

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

6490440 is a wasteful number, since it uses less digits than its factorization.

6490440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 6490440 is about 2547.6341966617. The cubic root of 6490440 is about 186.5340185724.

The spelling of 6490440 in words is "six million, four hundred ninety thousand, four hundred forty".