6690090 has 96 divisors (see below), whose sum is σ = 18768960. Its totient is φ = 1520640.

The previous prime is 6690067. The next prime is 6690107. The reversal of 6690090 is 900966.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68922 + ... + 69018.

It is an arithmetic number, because the mean of its divisors is an integer number (195510).

Almost surely, 2^6690090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6690090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9384480).

6690090 is an abundant number, since it is smaller than the sum of its proper divisors (12078870).

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

6690090 is a wasteful number, since it uses less digits than its factorization.

6690090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 6690090 is about 2586.5208292221. The cubic root of 6690090 is about 188.4273701339.

It can be divided in two parts, 6 and 690090, that added together give a palindrome (690096).

The spelling of 6690090 in words is "six million, six hundred ninety thousand, ninety".