26921789978 has 8 divisors (see below), whose sum is σ = 41685352320. Its totient is φ = 13026672540.

The previous prime is 26921789969. The next prime is 26921790001. The reversal of 26921789978 is 87998712962.

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, 217111148 + ... + 217111271.

It is an arithmetic number, because the mean of its divisors is an integer number (5210669040).

Almost surely, 2^26921789978 is an apocalyptic number.

26921789978 is a deficient number, since it is larger than the sum of its proper divisors (14763562342).

26921789978 is a wasteful number, since it uses less digits than its factorization.

26921789978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434222452.

The product of its digits is 54867456, while the sum is 68.

The spelling of 26921789978 in words is "twenty-six billion, nine hundred twenty-one million, seven hundred eighty-nine thousand, nine hundred seventy-eight".