6550640 has 20 divisors (see below), whose sum is σ = 15230424. Its totient is φ = 2620224.

The previous prime is 6550639. The next prime is 6550651. The reversal of 6550640 is 460556.

It is a tau number, because it is divible by the number of its divisors (20).

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, 40862 + ... + 41021.

Almost surely, 2^6550640 is an apocalyptic number.

It is an amenable number.

6550640 is an abundant number, since it is smaller than the sum of its proper divisors (8679784).

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

6550640 is a wasteful number, since it uses less digits than its factorization.

6550640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81896 (or 81890 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 6550640 is about 2559.4218097062. The cubic root of 6550640 is about 187.1089568736.

It can be divided in two parts, 65 and 50640, that added together give a palindrome (50705).

The spelling of 6550640 in words is "six million, five hundred fifty thousand, six hundred forty".