6216540240 has 80 divisors (see below), whose sum is σ = 19284265728. Its totient is φ = 1656626688.

The previous prime is 6216540217. The next prime is 6216540269. The reversal of 6216540240 is 420456126.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 6216540198 and 6216540207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 384969 + ... + 400791.

Almost surely, 2^6216540240 is an apocalyptic number.

6216540240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6216540240 is an abundant number, since it is smaller than the sum of its proper divisors (13067725488).

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

6216540240 is a wasteful number, since it uses less digits than its factorization.

6216540240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17476 (or 17470 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 6216540240 is about 78845.0394127620. The cubic root of 6216540240 is about 1838.7227509598.

Adding to 6216540240 its reverse (420456126), we get a palindrome (6636996366).

The spelling of 6216540240 in words is "six billion, two hundred sixteen million, five hundred forty thousand, two hundred forty".