26665616 has 40 divisors (see below), whose sum is σ = 54070200. Its totient is φ = 12723200.

The previous prime is 26665589. The next prime is 26665619. The reversal of 26665616 is 61656662.

It can be written as a sum of positive squares in 4 ways, for example, as 6451600 + 20214016 = 2540^2 + 4496^2 .

It is a super-2 number, since 2×26665616² = 1422110153318912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26665616.

It is not an unprimeable number, because it can be changed into a prime (26665619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46580 + ... + 47148.

It is an arithmetic number, because the mean of its divisors is an integer number (1351755).

Almost surely, 2^26665616 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 26665616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27035100).

26665616 is an abundant number, since it is smaller than the sum of its proper divisors (27404584).

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

26665616 is a wasteful number, since it uses less digits than its factorization.

26665616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707 (or 701 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 26665616 is about 5163.8760635786. The cubic root of 26665616 is about 298.7563926668.

The spelling of 26665616 in words is "twenty-six million, six hundred sixty-five thousand, six hundred sixteen".