26988982978 has 8 divisors (see below), whose sum is σ = 42864855372. Its totient is φ = 12700697856.

The previous prime is 26988982963. The next prime is 26988982987. The reversal of 26988982978 is 87928988962.

It can be written as a sum of positive squares in 2 ways, for example, as 26067071209 + 921911769 = 161453^2 + 30363^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396896775 + ... + 396896842.

Almost surely, 2^26988982978 is an apocalyptic number.

26988982978 is a deficient number, since it is larger than the sum of its proper divisors (15875872394).

26988982978 is a wasteful number, since it uses less digits than its factorization.

26988982978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793793636.

The product of its digits is 501645312, while the sum is 76.

The spelling of 26988982978 in words is "twenty-six billion, nine hundred eighty-eight million, nine hundred eighty-two thousand, nine hundred seventy-eight".