6600090 has 64 divisors (see below), whose sum is σ = 18475776. Its totient is φ = 1477632.

The previous prime is 6600071. The next prime is 6600101. The reversal of 6600090 is 900066.

It is a super-2 number, since 2×6600090² = 87122376016200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10834 + ... + 11426.

It is an arithmetic number, because the mean of its divisors is an integer number (288684).

Almost surely, 2^6600090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6600090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9237888).

6600090 is an abundant number, since it is smaller than the sum of its proper divisors (11875686).

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

6600090 is a wasteful number, since it uses less digits than its factorization.

6600090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 6600090 is about 2569.0640318996. The cubic root of 6600090 is about 187.5785981589.

The spelling of 6600090 in words is "six million, six hundred thousand, ninety".