6840522578 has 18 divisors (see below), whose sum is σ = 10346229957. Its totient is φ = 3392014000.

The previous prime is 6840522553. The next prime is 6840522607. The reversal of 6840522578 is 8752250486.

It can be written as a sum of positive squares in 2 ways, for example, as 6172144969 + 668377609 = 78563^2 + 25853^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=58483.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 27252953 + ... + 27253203.

Almost surely, 2^6840522578 is an apocalyptic number.

6840522578 is a deficient number, since it is larger than the sum of its proper divisors (3505707379).

6840522578 is an frugal number, since it uses more digits than its factorization.

6840522578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 47.

The square root of 6840522578 is about 82707.4517682657. The cubic root of 6840522578 is about 1898.2923325068.

The spelling of 6840522578 in words is "six billion, eight hundred forty million, five hundred twenty-two thousand, five hundred seventy-eight".