6645960 has 48 divisors (see below), whose sum is σ = 21600540. Its totient is φ = 1772160.

The previous prime is 6645949. The next prime is 6645971. The reversal of 6645960 is 695466.

It is a happy number.

6645960 is a `hidden beast` number, since 6 + 64 + 596 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (6645949) and next prime (6645971).

It can be written as a sum of positive squares in 2 ways, for example, as 5846724 + 799236 = 2418^2 + 894^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8871 + ... + 9590.

Almost surely, 2^6645960 is an apocalyptic number.

6645960 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6645960 is an abundant number, since it is smaller than the sum of its proper divisors (14954580).

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

6645960 is a wasteful number, since it uses less digits than its factorization.

6645960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18478 (or 18471 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 6645960 is about 2577.9759502369. The cubic root of 6645960 is about 188.0121464915.

The spelling of 6645960 in words is "six million, six hundred forty-five thousand, nine hundred sixty".