26979209640 has 96 divisors (see below), whose sum is σ = 89721609120. Its totient is φ = 7027138944.

The previous prime is 26979209611. The next prime is 26979209687. The reversal of 26979209640 is 4690297962.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 855942 + ... + 886901.

It is an arithmetic number, because the mean of its divisors is an integer number (934600095).

Almost surely, 2^26979209640 is an apocalyptic number.

26979209640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26979209640 is an abundant number, since it is smaller than the sum of its proper divisors (62742399480).

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

26979209640 is a wasteful number, since it uses less digits than its factorization.

26979209640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742903 (or 1742896 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The spelling of 26979209640 in words is "twenty-six billion, nine hundred seventy-nine million, two hundred nine thousand, six hundred forty".