6691720 has 32 divisors (see below), whose sum is σ = 17208000. Its totient is φ = 2294208.

The previous prime is 6691697. The next prime is 6691723. The reversal of 6691720 is 271966.

It is not an unprimeable number, because it can be changed into a prime (6691723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11670 + ... + 12229.

It is an arithmetic number, because the mean of its divisors is an integer number (537750).

Almost surely, 2^6691720 is an apocalyptic number.

It is an amenable number.

6691720 is an abundant number, since it is smaller than the sum of its proper divisors (10516280).

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

6691720 is a wasteful number, since it uses less digits than its factorization.

6691720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23917 (or 23913 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 6691720 is about 2586.8359051165. The cubic root of 6691720 is about 188.4426719545.

The spelling of 6691720 in words is "six million, six hundred ninety-one thousand, seven hundred twenty".