26656720 has 20 divisors (see below), whose sum is σ = 61977060. Its totient is φ = 10662656.

The previous prime is 26656711. The next prime is 26656723. The reversal of 26656720 is 2765662.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6190144 + 20466576 = 2488^2 + 4524^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×26656720³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26656723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166525 + ... + 166684.

It is an arithmetic number, because the mean of its divisors is an integer number (3098853).

Almost surely, 2^26656720 is an apocalyptic number.

26656720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26656720 is an abundant number, since it is smaller than the sum of its proper divisors (35320340).

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

26656720 is a wasteful number, since it uses less digits than its factorization.

26656720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333222 (or 333216 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 26656720 is about 5163.0146232603. The cubic root of 26656720 is about 298.7231659517.

The spelling of 26656720 in words is "twenty-six million, six hundred fifty-six thousand, seven hundred twenty".