6640650 has 48 divisors (see below), whose sum is σ = 18302400. Its totient is φ = 1770480.

The previous prime is 6640639. The next prime is 6640651. The reversal of 6640650 is 560466.

6640650 is a `hidden beast` number, since 6 + 6 + 4 + 0 + 650 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (6640651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1110 + ... + 3809.

It is an arithmetic number, because the mean of its divisors is an integer number (381300).

Almost surely, 2^6640650 is an apocalyptic number.

6640650 is an abundant number, since it is smaller than the sum of its proper divisors (11661750).

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

6640650 is a wasteful number, since it uses less digits than its factorization.

6640650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4940 (or 4929 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 6640650 is about 2576.9458667190. The cubic root of 6640650 is about 187.9620603990.

The spelling of 6640650 in words is "six million, six hundred forty thousand, six hundred fifty".