6665220 has 48 divisors (see below), whose sum is σ = 20737920. Its totient is φ = 1777248.

The previous prime is 6665213. The next prime is 6665231. The reversal of 6665220 is 225666.

6665220 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5632 + ... + 6711.

It is an arithmetic number, because the mean of its divisors is an integer number (432040).

Almost surely, 2^6665220 is an apocalyptic number.

6665220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6665220 is an abundant number, since it is smaller than the sum of its proper divisors (14072700).

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

6665220 is a wasteful number, since it uses less digits than its factorization.

6665220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12361 (or 12353 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 6665220 is about 2581.7087364767. The cubic root of 6665220 is about 188.1935911368.

It can be divided in two parts, 666 and 5220, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 6665220 in words is "six million, six hundred sixty-five thousand, two hundred twenty".