6534688978 has 36 divisors (see below), whose sum is σ = 10260613818. Its totient is φ = 3119450880.

The previous prime is 6534688969. The next prime is 6534688997. The reversal of 6534688978 is 8798864356.

It can be written as a sum of positive squares in 3 ways, for example, as 380757169 + 6153931809 = 19513^2 + 78447^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 57829050 + ... + 57829162.

Almost surely, 2^6534688978 is an apocalyptic number.

6534688978 is a deficient number, since it is larger than the sum of its proper divisors (3725924840).

6534688978 is an equidigital number, since it uses as much as digits as its factorization.

6534688978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 235 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 64.

The square root of 6534688978 is about 80837.4231281527. The cubic root of 6534688978 is about 1869.5696129832.

The spelling of 6534688978 in words is "six billion, five hundred thirty-four million, six hundred eighty-eight thousand, nine hundred seventy-eight".