6391042560 has 1200 divisors, whose sum is σ = 28956309624. Its totient is φ = 1337720832.

The previous prime is 6391042531. The next prime is 6391042583. The reversal of 6391042560 is 652401936.

It is a happy number.

6391042560 is a `hidden beast` number, since 6 + 3 + 91 + 0 + 4 + 2 + 560 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6341255424 + 49787136 = 79632^2 + 7056^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 172730862 + ... + 172730898.

Almost surely, 2^6391042560 is an apocalyptic number.

6391042560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6391042560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14478154812).

6391042560 is an abundant number, since it is smaller than the sum of its proper divisors (22565267064).

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

6391042560 is a wasteful number, since it uses less digits than its factorization.

6391042560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 6391042560 is about 79943.9963974782. The cubic root of 6391042560 is about 1855.7689466635.

The spelling of 6391042560 in words is "six billion, three hundred ninety-one million, forty-two thousand, five hundred sixty".