6610640 has 20 divisors (see below), whose sum is σ = 15369924. Its totient is φ = 2644224.

The previous prime is 6610621. The next prime is 6610673. The reversal of 6610640 is 460166.

It can be written as a sum of positive squares in 2 ways, for example, as 3254416 + 3356224 = 1804^2 + 1832^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×6610640² = 87401122419200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41237 + ... + 41396.

Almost surely, 2^6610640 is an apocalyptic number.

It is an amenable number.

6610640 is an abundant number, since it is smaller than the sum of its proper divisors (8759284).

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

6610640 is a wasteful number, since it uses less digits than its factorization.

6610640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82646 (or 82640 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 6610640 is about 2571.1164889985. The cubic root of 6610640 is about 187.6784907724.

The spelling of 6610640 in words is "six million, six hundred ten thousand, six hundred forty".