6646770 has 144 divisors (see below), whose sum is σ = 20554560. Its totient is φ = 1482624.

The previous prime is 6646769. The next prime is 6646777. The reversal of 6646770 is 776466.

6646770 is a `hidden beast` number, since 6 + 646 + 7 + 7 + 0 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646777) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 288979 + ... + 289001.

It is an arithmetic number, because the mean of its divisors is an integer number (142740).

Almost surely, 2^6646770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6646770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10277280).

6646770 is an abundant number, since it is smaller than the sum of its proper divisors (13907790).

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

6646770 is a wasteful number, since it uses less digits than its factorization.

6646770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 6646770 is about 2578.1330454420. The cubic root of 6646770 is about 188.0197843974.

The spelling of 6646770 in words is "six million, six hundred forty-six thousand, seven hundred seventy".