6537990 has 16 divisors (see below), whose sum is σ = 15691248. Its totient is φ = 1743456.

The previous prime is 6537989. The next prime is 6537991. The reversal of 6537990 is 997356.

It is an interprime number because it is at equal distance from previous prime (6537989) and next prime (6537991).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6537991) 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, 108937 + ... + 108996.

It is an arithmetic number, because the mean of its divisors is an integer number (980703).

Almost surely, 2^6537990 is an apocalyptic number.

6537990 is an abundant number, since it is smaller than the sum of its proper divisors (9153258).

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

6537990 is a wasteful number, since it uses less digits than its factorization.

6537990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217943.

The product of its (nonzero) digits is 51030, while the sum is 39.

The square root of 6537990 is about 2556.9493542110. The cubic root of 6537990 is about 186.9884366629.

The spelling of 6537990 in words is "six million, five hundred thirty-seven thousand, nine hundred ninety".