6444630 has 32 divisors (see below), whose sum is σ = 17186400. Its totient is φ = 1718496.

The previous prime is 6444619. The next prime is 6444631. The reversal of 6444630 is 364446.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 6444594 and 6444603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11665 + ... + 12204.

It is an arithmetic number, because the mean of its divisors is an integer number (537075).

Almost surely, 2^6444630 is an apocalyptic number.

6444630 is an abundant number, since it is smaller than the sum of its proper divisors (10741770).

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

6444630 is a wasteful number, since it uses less digits than its factorization.

6444630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23885 (or 23879 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 6444630 is about 2538.6275819820. The cubic root of 6444630 is about 186.0941250968.

The spelling of 6444630 in words is "six million, four hundred forty-four thousand, six hundred thirty".