26216720 has 80 divisors (see below), whose sum is σ = 66410928. Its totient is φ = 9584640.

The previous prime is 26216681. The next prime is 26216747. The reversal of 26216720 is 2761262.

It can be written as a sum of positive squares in 8 ways, for example, as 976144 + 25240576 = 988^2 + 5024^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 26216720.

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, 50060 + ... + 50580.

Almost surely, 2^26216720 is an apocalyptic number.

26216720 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 26216720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33205464).

26216720 is an abundant number, since it is smaller than the sum of its proper divisors (40194208).

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

26216720 is a wasteful number, since it uses less digits than its factorization.

26216720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588 (or 582 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 26216720 is about 5120.2265574875. The cubic root of 26216720 is about 297.0704485091.

Adding to 26216720 its reverse (2761262), we get a palindrome (28977982).

The spelling of 26216720 in words is "twenty-six million, two hundred sixteen thousand, seven hundred twenty".