26921405568 has 128 divisors (see below), whose sum is σ = 73373610240. Its totient is φ = 8740659200.

The previous prime is 26921405549. The next prime is 26921405573. The reversal of 26921405568 is 86550412962.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14341846 + ... + 14343722.

It is an arithmetic number, because the mean of its divisors is an integer number (573231330).

Almost surely, 2^26921405568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26921405568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36686805120).

26921405568 is an abundant number, since it is smaller than the sum of its proper divisors (46452204672).

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

26921405568 is a wasteful number, since it uses less digits than its factorization.

26921405568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2846 (or 2834 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 48.

The spelling of 26921405568 in words is "twenty-six billion, nine hundred twenty-one million, four hundred five thousand, five hundred sixty-eight".