6530640 has 40 divisors (see below), whose sum is σ = 20245728. Its totient is φ = 1741440.

The previous prime is 6530621. The next prime is 6530659. The reversal of 6530640 is 460356.

It is an interprime number because it is at equal distance from previous prime (6530621) and next prime (6530659).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6530640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13366 + ... + 13845.

Almost surely, 2^6530640 is an apocalyptic number.

6530640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6530640 is an abundant number, since it is smaller than the sum of its proper divisors (13715088).

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

6530640 is a wasteful number, since it uses less digits than its factorization.

6530640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27227 (or 27221 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 6530640 is about 2555.5116904448. The cubic root of 6530640 is about 186.9183396682.

Adding to 6530640 its reverse (460356), we get a palindrome (6990996).

The spelling of 6530640 in words is "six million, five hundred thirty thousand, six hundred forty".