6669990 has 48 divisors (see below), whose sum is σ = 17819568. Its totient is φ = 1729728.

The previous prime is 6669983. The next prime is 6670019. The reversal of 6669990 is 999666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2329 + ... + 4331.

It is an arithmetic number, because the mean of its divisors is an integer number (371241).

Almost surely, 2^6669990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6669990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8909784).

6669990 is an abundant number, since it is smaller than the sum of its proper divisors (11149578).

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

6669990 is a wasteful number, since it uses less digits than its factorization.

6669990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053 (or 2050 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 6669990 is about 2582.6323780205. The cubic root of 6669990 is about 188.2384743450.

The spelling of 6669990 in words is "six million, six hundred sixty-nine thousand, nine hundred ninety".