6430644 has 48 divisors (see below), whose sum is σ = 18191040. Its totient is φ = 1948320.

The previous prime is 6430621. The next prime is 6430661. The reversal of 6430644 is 4460346.

It is a happy number.

6430644 is digitally balanced in base 4 and base 5, because in such bases it contains all the possibile digits an equal number of times.

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

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, 1519 + ... + 3894.

It is an arithmetic number, because the mean of its divisors is an integer number (378980).

Almost surely, 2^6430644 is an apocalyptic number.

It is an amenable number.

6430644 is an abundant number, since it is smaller than the sum of its proper divisors (11760396).

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

6430644 is a wasteful number, since it uses less digits than its factorization.

6430644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5437 (or 5429 counting only the distinct ones).

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

The square root of 6430644 is about 2535.8714478459. The cubic root of 6430644 is about 185.9594084158.

The spelling of 6430644 in words is "six million, four hundred thirty thousand, six hundred forty-four".