6640265 has 8 divisors (see below), whose sum is σ = 7999560. Its totient is φ = 5291392.

The previous prime is 6640241. The next prime is 6640289. The reversal of 6640265 is 5620466.

It is an interprime number because it is at equal distance from previous prime (6640241) and next prime (6640289).

It can be written as a sum of positive squares in 4 ways, for example, as 4489 + 6635776 = 67^2 + 2576^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6640265 - 2⁸ = 6640009 is a prime.

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, 1124 + ... + 3813.

It is an arithmetic number, because the mean of its divisors is an integer number (999945).

Almost surely, 2^6640265 is an apocalyptic number.

It is an amenable number.

6640265 is a deficient number, since it is larger than the sum of its proper divisors (1359295).

6640265 is a wasteful number, since it uses less digits than its factorization.

6640265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5211.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 6640265 is about 2576.8711648043. The cubic root of 6640265 is about 187.9584278835.

The spelling of 6640265 in words is "six million, six hundred forty thousand, two hundred sixty-five".