6620538 has 32 divisors (see below), whose sum is σ = 13787136. Its totient is φ = 2117808.

The previous prime is 6620519. The next prime is 6620587. The reversal of 6620538 is 8350266.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 17095 + ... + 17477.

It is an arithmetic number, because the mean of its divisors is an integer number (430848).

Almost surely, 2^6620538 is an apocalyptic number.

6620538 is an abundant number, since it is smaller than the sum of its proper divisors (7166598).

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

6620538 is a wasteful number, since it uses less digits than its factorization.

6620538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 6620538 is about 2573.0406137486. The cubic root of 6620538 is about 187.7721133432.

The spelling of 6620538 in words is "six million, six hundred twenty thousand, five hundred thirty-eight".