6665720 has 16 divisors (see below), whose sum is σ = 14997960. Its totient is φ = 2666272.

The previous prime is 6665719. The next prime is 6665741. The reversal of 6665720 is 275666.

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, 83282 + ... + 83361.

Almost surely, 2^6665720 is an apocalyptic number.

It is an amenable number.

6665720 is an abundant number, since it is smaller than the sum of its proper divisors (8332240).

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

6665720 is a wasteful number, since it uses less digits than its factorization.

6665720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166654 (or 166650 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 6665720 is about 2581.8055697515. The cubic root of 6665720 is about 188.1982968801.

The spelling of 6665720 in words is "six million, six hundred sixty-five thousand, seven hundred twenty".