6428660 has 48 divisors (see below), whose sum is σ = 15773184. Its totient is φ = 2155008.

The previous prime is 6428651. The next prime is 6428671. The reversal of 6428660 is 668246.

It is a happy number.

It is a congruent number.

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, 6092 + ... + 7068.

It is an arithmetic number, because the mean of its divisors is an integer number (328608).

Almost surely, 2^6428660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6428660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7886592).

6428660 is an abundant number, since it is smaller than the sum of its proper divisors (9344524).

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

6428660 is a wasteful number, since it uses less digits than its factorization.

6428660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040 (or 1038 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 6428660 is about 2535.4802306467. The cubic root of 6428660 is about 185.9402822124.

It can be divided in two parts, 64286 and 60, that added together give a palindrome (64346).

The spelling of 6428660 in words is "six million, four hundred twenty-eight thousand, six hundred sixty".