6645090 has 32 divisors (see below), whose sum is σ = 16018560. Its totient is φ = 1764224.

The previous prime is 6645083. The next prime is 6645131. The reversal of 6645090 is 905466.

It is a super-2 number, since 2×6645090² = 88314442216200, which contains 22 as substring.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10462 + ... + 11078.

It is an arithmetic number, because the mean of its divisors is an integer number (500580).

Almost surely, 2^6645090 is an apocalyptic number.

6645090 is an abundant number, since it is smaller than the sum of its proper divisors (9373470).

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

6645090 is a wasteful number, since it uses less digits than its factorization.

6645090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 6645090 is about 2577.8072076864. The cubic root of 6645090 is about 188.0039421235.

The spelling of 6645090 in words is "six million, six hundred forty-five thousand, ninety".