26978556 has 96 divisors (see below), whose sum is σ = 74833920. Its totient is φ = 7473600.

The previous prime is 26978543. The next prime is 26978557. The reversal of 26978556 is 65587962.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26978557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77575 + ... + 77921.

It is an arithmetic number, because the mean of its divisors is an integer number (779520).

Almost surely, 2^26978556 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 26978556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37416960).

26978556 is an abundant number, since it is smaller than the sum of its proper divisors (47855364).

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

26978556 is a wasteful number, since it uses less digits than its factorization.

26978556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415 (or 413 counting only the distinct ones).

The product of its digits is 907200, while the sum is 48.

The square root of 26978556 is about 5194.0885629723. The cubic root of 26978556 is about 299.9205567422.

The spelling of 26978556 in words is "twenty-six million, nine hundred seventy-eight thousand, five hundred fifty-six".