6489990 has 96 divisors (see below), whose sum is σ = 19081440. Its totient is φ = 1560384.

The previous prime is 6489983. The next prime is 6489991. The reversal of 6489990 is 999846.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6489991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 150909 + ... + 150951.

It is an arithmetic number, because the mean of its divisors is an integer number (198765).

Almost surely, 2^6489990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6489990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9540720).

6489990 is an abundant number, since it is smaller than the sum of its proper divisors (12591450).

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

6489990 is a wasteful number, since it uses less digits than its factorization.

6489990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 6489990 is about 2547.5458778990. The cubic root of 6489990 is about 186.5297075011.

The spelling of 6489990 in words is "six million, four hundred eighty-nine thousand, nine hundred ninety".