6620557 has 8 divisors (see below), whose sum is σ = 6846840. Its totient is φ = 6397440.

The previous prime is 6620519. The next prime is 6620587. The reversal of 6620557 is 7550266.

It can be written as a sum of positive squares in 4 ways, for example, as 1394761 + 5225796 = 1181^2 + 2286^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6620557 - 2¹¹ = 6618509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6620507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3919 + ... + 5347.

It is an arithmetic number, because the mean of its divisors is an integer number (855855).

Almost surely, 2^6620557 is an apocalyptic number.

It is an amenable number.

6620557 is a deficient number, since it is larger than the sum of its proper divisors (226283).

6620557 is a wasteful number, since it uses less digits than its factorization.

6620557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 6620557 is about 2573.0443058758. The cubic root of 6620557 is about 187.7722929694.

The spelling of 6620557 in words is "six million, six hundred twenty thousand, five hundred fifty-seven".