6440628 has 12 divisors (see below), whose sum is σ = 15028160. Its totient is φ = 2146872.

The previous prime is 6440587. The next prime is 6440641. The reversal of 6440628 is 8260446.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 6440595 and 6440604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268348 + ... + 268371.

Almost surely, 2^6440628 is an apocalyptic number.

It is an amenable number.

6440628 is an abundant number, since it is smaller than the sum of its proper divisors (8587532).

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

6440628 is a wasteful number, since it uses less digits than its factorization.

6440628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536726 (or 536724 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 6440628 is about 2537.8392384074. The cubic root of 6440628 is about 186.0555967458.

The spelling of 6440628 in words is "six million, four hundred forty thousand, six hundred twenty-eight".