6556690 has 24 divisors (see below), whose sum is σ = 13729932. Its totient is φ = 2247840.

The previous prime is 6556673. The next prime is 6556699. The reversal of 6556690 is 966556.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6036849 + 519841 = 2457^2 + 721^2 .

It is a super-2 number, since 2×6556690² = 85980367512200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6556699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6201 + ... + 7180.

Almost surely, 2^6556690 is an apocalyptic number.

6556690 is an abundant number, since it is smaller than the sum of its proper divisors (7173242).

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

6556690 is a wasteful number, since it uses less digits than its factorization.

6556690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13402 (or 13395 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 6556690 is about 2560.6034445029. The cubic root of 6556690 is about 187.1665421309.

It can be divided in two parts, 65566 and 90, that added together give a palindrome (65656).

The spelling of 6556690 in words is "six million, five hundred fifty-six thousand, six hundred ninety".