6636540 has 24 divisors (see below), whose sum is σ = 18582480. Its totient is φ = 1769728.

The previous prime is 6636527. The next prime is 6636557. The reversal of 6636540 is 456366.

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 = 6636498 and 6636507.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55245 + ... + 55364.

It is an arithmetic number, because the mean of its divisors is an integer number (774270).

Almost surely, 2^6636540 is an apocalyptic number.

6636540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6636540 is an abundant number, since it is smaller than the sum of its proper divisors (11945940).

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

6636540 is a wasteful number, since it uses less digits than its factorization.

6636540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110621 (or 110619 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 6636540 is about 2576.1482876574. The cubic root of 6636540 is about 187.9232748635.

The spelling of 6636540 in words is "six million, six hundred thirty-six thousand, five hundred forty".