26978220 has 72 divisors (see below), whose sum is σ = 83092464. Its totient is φ = 7083648.

The previous prime is 26978213. The next prime is 26978251. The reversal of 26978220 is 2287962.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 10942 + ... + 13178.

It is an arithmetic number, because the mean of its divisors is an integer number (1154062).

Almost surely, 2^26978220 is an apocalyptic number.

26978220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26978220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41546232).

26978220 is an abundant number, since it is smaller than the sum of its proper divisors (56114244).

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

26978220 is a wasteful number, since it uses less digits than its factorization.

26978220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2319 (or 2314 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 26978220 is about 5194.0562184097. The cubic root of 26978220 is about 299.9193116332.

The spelling of 26978220 in words is "twenty-six million, nine hundred seventy-eight thousand, two hundred twenty".