26989720 has 64 divisors (see below), whose sum is σ = 64152000. Its totient is φ = 10203648.

The previous prime is 26989717. The next prime is 26989751. The reversal of 26989720 is 2798962.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61261 + ... + 61699.

It is an arithmetic number, because the mean of its divisors is an integer number (1002375).

Almost surely, 2^26989720 is an apocalyptic number.

26989720 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 26989720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32076000).

26989720 is an abundant number, since it is smaller than the sum of its proper divisors (37162280).

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

26989720 is a wasteful number, since it uses less digits than its factorization.

26989720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 26989720 is about 5195.1631350709. The cubic root of 26989720 is about 299.9619210928.

The spelling of 26989720 in words is "twenty-six million, nine hundred eighty-nine thousand, seven hundred twenty".