6545640 has 32 divisors (see below), whose sum is σ = 19637280. Its totient is φ = 1745472.

The previous prime is 6545621. The next prime is 6545641. The reversal of 6545640 is 465456.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 6545598 and 6545607.

It is not an unprimeable number, because it can be changed into a prime (6545641) 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 7 ways as a sum of consecutive naturals, for example, 27154 + ... + 27393.

It is an arithmetic number, because the mean of its divisors is an integer number (613665).

Almost surely, 2^6545640 is an apocalyptic number.

6545640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6545640 is an abundant number, since it is smaller than the sum of its proper divisors (13091640).

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

6545640 is a wasteful number, since it uses less digits than its factorization.

6545640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54561 (or 54557 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 6545640 is about 2558.4448401324. Note that the first 3 decimals coincide. The cubic root of 6545640 is about 187.0613389862.

The spelling of 6545640 in words is "six million, five hundred forty-five thousand, six hundred forty".