6540724 has 6 divisors (see below), whose sum is σ = 11446274. Its totient is φ = 3270360.

The previous prime is 6540719. The next prime is 6540739. The reversal of 6540724 is 4270456.

It can be written as a sum of positive squares in only one way, i.e., 5438224 + 1102500 = 2332^2 + 1050^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6540692 and 6540701.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 817587 + ... + 817594.

Almost surely, 2^6540724 is an apocalyptic number.

It is an amenable number.

6540724 is a deficient number, since it is larger than the sum of its proper divisors (4905550).

6540724 is a wasteful number, since it uses less digits than its factorization.

6540724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635185 (or 1635183 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 6540724 is about 2557.4839197930. The cubic root of 6540724 is about 187.0144974319.

The spelling of 6540724 in words is "six million, five hundred forty thousand, seven hundred twenty-four".