6640036 has 24 divisors (see below), whose sum is σ = 12612600. Its totient is φ = 3040512.

The previous prime is 6640027. The next prime is 6640061. The reversal of 6640036 is 6300466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 360000 + 6280036 = 600^2 + 2506^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7320 + ... + 8176.

It is an arithmetic number, because the mean of its divisors is an integer number (525525).

Almost surely, 2^6640036 is an apocalyptic number.

It is an amenable number.

6640036 is a deficient number, since it is larger than the sum of its proper divisors (5972564).

6640036 is a wasteful number, since it uses less digits than its factorization.

6640036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023 (or 1021 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 6640036 is about 2576.8267306903. The cubic root of 6640036 is about 187.9562671778.

The spelling of 6640036 in words is "six million, six hundred forty thousand, thirty-six".