6691920 has 40 divisors (see below), whose sum is σ = 20745696. Its totient is φ = 1784448.

The previous prime is 6691903. The next prime is 6691943. The reversal of 6691920 is 291966.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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, 13702 + ... + 14181.

Almost surely, 2^6691920 is an apocalyptic number.

6691920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6691920 is an abundant number, since it is smaller than the sum of its proper divisors (14053776).

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

6691920 is a wasteful number, since it uses less digits than its factorization.

6691920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27899 (or 27893 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 6691920 is about 2586.8745620923. The cubic root of 6691920 is about 188.4445493074. Note that the first 3 decimals are identical.

The spelling of 6691920 in words is "six million, six hundred ninety-one thousand, nine hundred twenty".