6340644 has 18 divisors (see below), whose sum is σ = 16027830. Its totient is φ = 2113536.

The previous prime is 6340637. The next prime is 6340657. The reversal of 6340644 is 4460436.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5760000 + 580644 = 2400^2 + 762^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88029 + ... + 88100.

It is an arithmetic number, because the mean of its divisors is an integer number (890435).

Almost surely, 2^6340644 is an apocalyptic number.

It is an amenable number.

6340644 is an abundant number, since it is smaller than the sum of its proper divisors (9687186).

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

6340644 is a wasteful number, since it uses less digits than its factorization.

6340644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176139 (or 176134 counting only the distinct ones).

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

The square root of 6340644 is about 2518.0635416923. The cubic root of 6340644 is about 185.0877985980.

The spelling of 6340644 in words is "six million, three hundred forty thousand, six hundred forty-four".