6391247240 has 64 divisors (see below), whose sum is σ = 17401392000. Its totient is φ = 2062384128.

The previous prime is 6391247237. The next prime is 6391247279. The reversal of 6391247240 is 427421936.

It is a junction number, because it is equal to n+sod(n) for n = 6391247194 and 6391247203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 666590 + ... + 676109.

It is an arithmetic number, because the mean of its divisors is an integer number (271896750).

Almost surely, 2^6391247240 is an apocalyptic number.

It is an amenable number.

6391247240 is an abundant number, since it is smaller than the sum of its proper divisors (11010144760).

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

6391247240 is a wasteful number, since it uses less digits than its factorization.

6391247240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342734 (or 1342730 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 6391247240 is about 79945.2765333888. The cubic root of 6391247240 is about 1855.7887574497.

The spelling of 6391247240 in words is "six billion, three hundred ninety-one million, two hundred forty-seven thousand, two hundred forty".