26291720 has 128 divisors (see below), whose sum is σ = 75479040. Its totient is φ = 8017920.

The previous prime is 26291653. The next prime is 26291731. The reversal of 26291720 is 2719262.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112724 + ... + 112956.

It is an arithmetic number, because the mean of its divisors is an integer number (589680).

Almost surely, 2^26291720 is an apocalyptic number.

26291720 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 26291720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37739520).

26291720 is an abundant number, since it is smaller than the sum of its proper divisors (49187320).

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

26291720 is a wasteful number, since it uses less digits than its factorization.

26291720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 26291720 is about 5127.5452216436. The cubic root of 26291720 is about 297.3534621875.

The spelling of 26291720 in words is "twenty-six million, two hundred ninety-one thousand, seven hundred twenty".