6408778530 has 128 divisors (see below), whose sum is σ = 19584737280. Its totient is φ = 1303338240.

The previous prime is 6408778529. The next prime is 6408778561. The reversal of 6408778530 is 358778046.

It is a self number, because there is not a number n which added to its sum of digits gives 6408778530.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 79056 + ... + 138084.

It is an arithmetic number, because the mean of its divisors is an integer number (153005760).

Almost surely, 2^6408778530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6408778530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9792368640).

6408778530 is an abundant number, since it is smaller than the sum of its proper divisors (13175958750).

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

6408778530 is a wasteful number, since it uses less digits than its factorization.

6408778530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59104.

The product of its (nonzero) digits is 1128960, while the sum is 48.

The square root of 6408778530 is about 80054.8470112835. The cubic root of 6408778530 is about 1857.4840274278.

The spelling of 6408778530 in words is "six billion, four hundred eight million, seven hundred seventy-eight thousand, five hundred thirty".