6538563840 has 72 divisors (see below), whose sum is σ = 20882550528. Its totient is φ = 1743616000.

The previous prime is 6538563839. The next prime is 6538563869. The reversal of 6538563840 is 483658356.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 6538563840.

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, 847536 + ... + 855215.

It is an arithmetic number, because the mean of its divisors is an integer number (290035424).

Almost surely, 2^6538563840 is an apocalyptic number.

6538563840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6538563840 is an abundant number, since it is smaller than the sum of its proper divisors (14343986688).

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

6538563840 is a wasteful number, since it uses less digits than its factorization.

6538563840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702775 (or 1702761 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 48.

The square root of 6538563840 is about 80861.3865822248. The cubic root of 6538563840 is about 1869.9390716706.

The spelling of 6538563840 in words is "six billion, five hundred thirty-eight million, five hundred sixty-three thousand, eight hundred forty".