6620990 has 48 divisors (see below), whose sum is σ = 13262400. Its totient is φ = 2376192.

The previous prime is 6620981. The next prime is 6621029. The reversal of 6620990 is 990266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83771 + ... + 83849.

It is an arithmetic number, because the mean of its divisors is an integer number (276300).

Almost surely, 2^6620990 is an apocalyptic number.

6620990 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

6620990 is a wasteful number, since it uses less digits than its factorization.

6620990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 6620990 is about 2573.1284460749. The cubic root of 6620990 is about 187.7763864633.

The spelling of 6620990 in words is "six million, six hundred twenty thousand, nine hundred ninety".