6446628 has 60 divisors (see below), whose sum is σ = 17106012. Its totient is φ = 2116800.

The previous prime is 6446623. The next prime is 6446633. The reversal of 6446628 is 8266446.

It is a happy number.

6446628 is a `hidden beast` number, since 644 + 6 + 6 + 2 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (6446623) and next prime (6446633).

It can be written as a sum of positive squares in 2 ways, for example, as 6260004 + 186624 = 2502^2 + 432^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6446592 and 6446601.

It is not an unprimeable number, because it can be changed into a prime (6446623) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32626 + ... + 32822.

Almost surely, 2^6446628 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 6446628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8553006).

6446628 is an abundant number, since it is smaller than the sum of its proper divisors (10659384).

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

6446628 is a wasteful number, since it uses less digits than its factorization.

6446628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 303 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 6446628 is about 2539.0210712005. The cubic root of 6446628 is about 186.1133544213.

The spelling of 6446628 in words is "six million, four hundred forty-six thousand, six hundred twenty-eight".