6520990 has 32 divisors (see below), whose sum is σ = 14123520. Its totient is φ = 2117664.

The previous prime is 6520981. The next prime is 6520999. The reversal of 6520990 is 990256.

It is an interprime number because it is at equal distance from previous prime (6520981) and next prime (6520999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6520999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1122 + ... + 3781.

It is an arithmetic number, because the mean of its divisors is an integer number (441360).

Almost surely, 2^6520990 is an apocalyptic number.

6520990 is an abundant number, since it is smaller than the sum of its proper divisors (7602530).

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

6520990 is a wasteful number, since it uses less digits than its factorization.

6520990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4936.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 6520990 is about 2553.6229165638. The cubic root of 6520990 is about 186.8262276571.

The spelling of 6520990 in words is "six million, five hundred twenty thousand, nine hundred ninety".